Yes, it should be once I'm done. Not as big as Modern of course, but probably as big as at least 2-3 standards combined.

Some black cmc 2 creatures:

Black Cat
Creature - Cat (zombie type removed)

Child of Night

Bloodsucker Bat
Creature - Bat Vampire
Flying, Lifelink
1/1

Foul Imp

Walking Corpse

Ravenous Rats

Large Viper
Creature - Snake
Deathtouch
1/3

Vicious Blood-Taster
Creature - Human Shaman Barbarian
Haste
2/2

Hexing Battlemage
Creature - Human Wizard Soldier
First Strike
2/1

Secret Seller
Creature - Human Demon Shaman
As an additional cost to cast Secret Seller, pay 1 life.
When Secret Seller enters the battlefield, reveal the top card of your library, you lose life equal to the revealed card's converted mana cost, then put it into your hand.
2/2

Rage Brander
Creature - Elemental Spirit
Wither (This deals damage to creatures in the form of -1/-1 counters.)
2/1

Screaming Soul
Creature - Spirit
As an additional cost to cast Screaming Soul, pay 1 life.
Haste
When Screaming Soul enters the battlefield, target creature can't block this turn.
2/1

Fear Mage
Creature - Human Shaman
, : Target creature can't block this turn.
1/2

Hunter Bat

Bane Alley Blackguard

Venom Mage

Reassembling Skeleton

Vampiric Thrall

Bound Spirit
Creature - Spirit
Sacrifice Bound Spirit: Add to your mana pool and gain 2 life.
1/2

Cult Leader
Creature - Human Wizard
Sacrifice a creature: Target creature gets +1/+1 until end of turn.
2/1

Bloodthrone Vampire

Black Knight
Creature - Human Knight
First Strike
Black Knight can't be the target of white spells with converted mana cost 3 or less.
Black Knight can't be the target of white abilities from sources with converted mana cost 3 or less.
Whenever Black Knight attacks a player who controls a plains, or blocks a white creature, it gets +2/+2 until end of turn.
2/2

Anti-Druid
Creature - Human Shaman
Wither (This deals damage to creatures in the form of -1/-1 counters.)
Anti-Druid can't be the target of green spells with converted mana cost 3 or less.
Anti-Druid can't be the target of green abilities from sources with converted mana cost 3 or less.
Whenever Anti-Druid attacks a player who controls a forest, or blocks a green creature, it gets +2/+2 until end of turn.
2/2

Living Corruption
Creature - Spirit Horror
If you control at least two other black permanents, Living Corruption gets +1/+1 and first strike.
If you control at least four other black permanents, Living Corruption gets an additional +2/+2 and trample.
If you control at least six other black permanents, Living Corruption gets and additional +3/+3 and deathtouch.
2/2

Adaptable Infiltrator
Creature - Human Rogue
If you control an island, Adaptable Infiltrator gets +1/+1.
If you control a mountain, Adaptable Infiltrator gets an additional +1/+0 and first strike.
1/1

Spiritgrasp Wall
Creature - Spirit Wall
Defender
Wither (This deals damage to creatures in the form of -1/-1 counters.)
1/4

Some cmc 2 red creatures:

Borderland Marauder

Dragon Hatchling

Lightning Mauler

Pyre Charger

Satyr Rambler

Sigiled Skink

Sparkmage Apprentice

Wall of Torches

Smiling Duelist
Creature - Human Warrior
Double strike
1/1

Searing Body
Creature - Elemental
Wither (This deals damage to creatures in the form of -1/-1 counters.)
2/2

Searing Lasher
Creature - Human Shaman Warrior
First strike
Wither (This deals damage to creatures in the form of -1/-1 counters.)
1/2

Excited Goblin
Creature - Goblin Warrior
Haste
2/1

Goblin Flunkies
Creature - Goblin Warrior

Axe Swinger
Creature - Human Warrior
3/1

Shouting Chieftain
Creature - Human Shaman Warrior
Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
3/1

Energizer Mage

Bomber Corps
(remove 'battalion' ability word, but keep the actual ability)

Challenge Seeker
Creature - Human Warrior
Challenge 2 (When this blocks or becomes blocked, it gets +2/+2 until end of turn.)
1/1

Shock Trooper
Creature - Human Soldier
First strike, Haste
2/2

Kiln Beast rr
Creature - Elemental Beast
Whenever you cast an instant or sorcery spell, Kiln Beast gets +2/+0 until end of turn.
1/2

Team Striker
Creature - Human Soldier
Whenever another creature enters the battlefield under your control, Team Striker gets +1/+0 and gains trample until end of turn.
2/1

Æther Dancer
Creature - Human Monk
Prowess
2/1

Fan of Duels
Creature - Human Warrior Shaman
Exalted
2/1

Terrifying Berserker
Creature - Human Warrior
When Terrifying Berserker enters the battlefield, target creature can't block this turn.
Terrifying Berserker attacks each turn if able.
2/2

Team Feinter
Creature - Human Soldier Rogue
Whenever Team Feinter and at least two other creatures attack, target creature can't block this turn.
2/1

Freedom Fighter
Creature - Human Soldier
First Strike
Freedom Fighter can't be the target of white spells with converted mana cost 3 or less.
Freedom Fighter can't be the target of white abilities from sources with converted mana cost 3 or less.
Whenever Freedom Fighter attacks a player who controls a plains, or blocks a white creature, it gets +2/+2 until end of turn.
2/2

Knight of the Rose
Creature - Human Knight Archer
Reach, Trample
Knight of the Rose can't be the target of blue spells with converted mana cost 3 or less.
Knight of the Rose can't be the target of blue abilities from sources with converted mana cost 3 or less.
Whenever Knight of the Rose attacks a player who controls an island, or blocks a blue creature, it gets +2/+2 until end of turn.
2/2

Passionate Hero
Creature - Human Soldier
If you control at least two other red permanents, Passionate Hero gets +1/+1 and Trample and Haste.
If you control at least four other red permanents, Passionate Hero gets an additional +3/+3.
If you control at least six other red permanents, Passionate Hero gets and additional +2/+2 and Double strike.
2/2

Wandering Bard
Creature - Human Rogue Shaman
If you control a swamp, Wandering Bard gets +0/+2 and Exalted.
If you control a forest, Wandering Bard gets an additional +1/+1.
1/1

Star-Crossed Maiden
Legendary Creature - Human Shaman
If you control Star-Crossed Gentleman, Star-Crossed Maiden gets +1/+1 and Prowess.
1/3

Star-Crossed Gentleman
Legendary Creature - Human Soldier
If you control Star-Crossed Maiden, Star-Crossed Gentleman gets +1/+1 and First Strike.
2/1

Some cmc 2 green creatures:

Ambush Viper

Deadly Recluse

Highland Game

Juvenile Gloomwidow

Lotus Cobra

Nightshade Peddler

Vine Trellis

Voyaging Satyr

Grizzly Bears

Tusk Monster

Wild Companion

Skylasher
Creature - Insect Beast
Flash
Reach
Whenever Skylasher blocks or is blocked by a blue creature with flying, it gets +2/+2 until end of turn.
2/2

Ambush Panther
Creature - Cat
Flash
2/2

Wary Herd
Creature - Beast
Vigilance
2/2

Komodo Chomper
Creature - Lizard
Deathtouch
2/2

Vibrant Shaman
Creature - Human Shaman
: Add one mana of any color to your mana pool.
2/1

Savage Steetspiter
Creature - Human Warrior
Vigilance
Savage Steetspiter can't be the target of abilities from artifact sources with converted mana cost 3 or less.
Whenever Savage Steetspiter attacks a player who controls an artifact, or blocks an artifact creature, it gets +2/+2 until end of turn.
2/2

Wall of Blossoms

Mage Hunter
Creature - Elf Archer Soldier
Reach, Vigilance
Mage Hunter can't be the target of blue spells with converted mana cost 3 or less.
Mage Hunter can't be the target of blue abilities from sources with converted mana cost 3 or less.
Whenever Mage Hunter attacks a player who controls an island, or blocks a blue creature, it gets +2/+2 until end of turn.
2/3

Destroyer of Corruption
Creature - Elf Druid
Reach, Vigilance
Destroyer of Corruption can't be the target of black spells with converted mana cost 3 or less.
Destroyer of Corruption can't be the target of black abilities from sources with converted mana cost 3 or less.
Whenever Destroyer of Corruption attacks a player who controls a swamp, or blocks a black creature, it gets +2/+2 until end of turn.
3/2

Ecosystem Embodiment
Creature - Avatar
If you control at least two other green permanents, Ecosystem Embodiment gets +2/+2 and reach.
If you control at least four other green permanents, Ecosystem Embodiment gets an additional +3/+4 and trample.
If you control at least six other green permanents, Ecosystem Embodiment gets and additional +3/+3 and vigilance.
2/2

Vista Seeker
Creature - Human Scout
If you control a plains, Vista Seeker gets +1/+1 and Reach.
If you control a island, Vista Seeker gets an additional +1/+1 and Vigilance.
1/1

Ambush Predator
Creature - Beast
Flash
Haste
2/2

Some cmc 3 colorless artifact creatures:

Signal Pest
Artifact Creature - Insect
Flying
Battle cry (Whenever this creature attacks, each other attacking creature gets +1/+0 until end of turn.)
0/2

Bronze Sable

Hovering Skirmish-Thopter
Artifact Creature - Thopter
Flying, Vigilance
1/2

Explosive Skuttler
Artifact Creature - Construct
When Explosive Skuttler dies, it deals 2 damage to target creature or player.
1/1

Gold Etched Wall
Artifact Creature - Wall
Defender
: Add to your mana pool.
0/3

Silver Etched Wall
Artifact Creature - Wall
Defender
: Add to your mana pool.
0/3

Lead Spike Wall
Artifact Creature - Wall
Defender, Wither
: Add to your mana pool.
1/1

Iron Spear Wall
Artifact Creature - Wall
Defender, First Strike
: Add to your mana pool.
1/1

Copper Spine Tower
Artifact Creature - Wall
Defender, Reach
: Add to your mana pool.
1/2

Chargesharer Golem
Artifact Creature - Golem
If you control at least two other artifacts, Chargesharer Golem gets +1/+1.
If you control at least four other artifacts, Chargesharer Golem gets an additional +2/+2.
If you control at least six other artifacts, Chargesharer Golem gets an additional +3/+3 and trample.
1/1

Prism Critter
Artifact Creature - Construct Beast
If you control at least one each of plains, island, swamp, mountain, and forest, then Prism Critter gets +3/+3, vigilance, haste, reach, and first strike.
1/1