Coveted Contraband
Artifact - Food Treasure (u)
, : Exchange control of ~ and target nonland permanent you don't control with mana value X or less.
, Sacrifice ~: Add one mana of any color.
, , Sacrifice ~: You gain 3 life.

Primordial Mox
Legendary Artifact (R)
: Add . Spend this mana only to cast creature spells with power 5 or higher.

The Travails
Enchantment — Saga (M)
I - If there are four or more card types among cards in your graveyard, destroy target permanent. Otherwise, investigate.
II - If there are four or more card types among cards in your graveyard, you gain control of target creature as long as you control The Travails, untap it, and it gains haste. Otherwise, investigate.
III - If there are four or more card types among cards in your graveyard, sacrifice any number of creatures. For each creature you sacrificed, create a 3/2 colorless Eldrazi Horror creature token. Otherwise, investigate.
IV - If there are four or more card types among cards in your graveyard, you gain control of target opponent during that player’s next turn. Otherwise, they gain control of you during this turn.

Town Guard
Creature ─ Human Soldier (C)
Vigilance
If you control two or more Town Guards, creatures you control get +1/+1.
2/2

Coordinated Rebuke
Instant (U)
Cast ~ only if you control one or more blocking creatures or if you control two or more creatures with the same name.
Target creature has base power and toughness 0/1 and loses all abilities until end of combat.
"Looks like a certain rebel upstart needs to be humbled, eh, brother?"

Intrepid Company
Enchantment (R)
1/1 creatures you control have double strike, vigilance and lifelink.

Andreus, Humbling Heir
Legendary Creature - Spirit Noble Advisor (M)
Other creatures lose all abilities and have base power and toughness 1/1.
1/1 creatures you control have Ward .
~ has Ward , where X is the number of 1/1 creatures you control.
"Be small, lest the horrors of this world consider you adequate prey."
[3/3]

Middle Management
Creature ─ Human Advisor (C)
, : Scry 1.
, , Exert Middle Management: Draw a card.
0/2
His head in his hands, Gruk sometimes wondered why they had banned the whip.

Squash the Uprising

Instant (U)
Return target creature an opponent controls to its owner’s hand. Creatures that player controls get -2/-0 until end of turn.
“For all their boisterous ideals, the rebels turn and run the moment they encounter any real obstacle.”
—Vorta Vhim, Hand of Peace

Identify the Leaders
Sorcery (R)
Each player may search their library for a creature card, reveal it and put it into their hands, then each player that did shuffles. For each opponent that searched their library in this way, draw a card.
His intelligence paid off. He didn't like it, but at least he knew who his enemies were.

All-Seeing Arbiter

Creature -- Sphinx (M)
Flying
When All-Seeing Arbiter attacks, draw a card for each card you’ve drawn this turn.
Discard a card: Counter target spell that targets All-Seeing Arbiter unless that spell’s controller pays .
5/5

Fear of Spiders
Sorcery (C)
Create a 1/1 black spider creature token with skulk.
Phobia ─ If an opponent has three or less card in their hand, create two 1/1 black spider creature tokens with skulk instead.
Even though he knew it wasn't there, he just couldn't shake the wiggles.

Spider Bite

Instant (U)
Phobia —Target creature gets -1/-1 until end of turn. If that creature's controller is afraid of Spiders, destroy that creature instead. (A player is afraid of Spiders if they've been dealt 5 or more combat damage by Spiders this game.)

Sorry to jack your idea, Dudibus, but it inspired me!

Explosive Infestation
Tribal Sorcery - Spider (R)
Spider Phobia - Destroy all creatures. For each creature destroyed this way, if its controller has been dealt 5 or more combat damage by spiders this game, create a 1/1 black Spider creature token.

Further modifying to make the ability word a [type] phobia for other options

Yours is better. I was trying to think of some way to represent fear, which sort of translated to a weakness of mind, which really isn't accurate, which translated to cards in hand...

Arachnophobe Nightmare
Sorcery (M)
Affinity for Spiders
Target player skips their next turn.
Spider Phobia ─ You control target player on their next turn instead if its controller has been dealt 5 or more combat damage by spiders this game.
They found him wrapped in webs, the rictus of death frozen in a muffled scream.

Pyrobrandisher
Creature — Goblin Shaman
Pyrophobia — Pyrobrandisher has menace as long as it's attacking a player that has been dealt 5 or more damage by spells this turn.
2/1

Fear Reveler
Creature - Satyr Warrior (u)
Haste
Spell Phobia - ~ enters the battlefield tapped unless an opponent has been dealt 5 or more damage by spells this game.
"Here's to life, and even moreso to the terror of burning it all away."
[2/2]

Nightmares Realized
Sorcery (R)
Nightmares Realized deals 7 damage to target player.
Pyrophobia - Nightmares Realized can't target players that have been dealt 5 or more damage by spells this game.
The flare of the match was an inferno.

Mothflame Heartbreaker
Creature — Human Warrior
Haste
Pyrophobia — At the beginning of your combat, choose target opponent. If they've been dealt 5 or more damage by spells this game, choose a creature they control. Otherwise, they choose a creature they control. You gain control of the chosen creature until end of turn. Untap it and it gains haste until end of turn.
4/2