Beast Boy, the Changeling —
Legendary Creature — Human Shapeshifter (R)
: Beast Boy becomes a copy of an animal creature card you own from outside the game with combined power and toughness no more than X greater than Beast Boy's combined power and toughness, except it's still a legendary creature card named Beast Boy, the Changeling and still has this ability. (Animal creature types are Antelope, Ape, Aurochs, Badger, Bat, Bear, Beast, Bird, Boar, Camel, Caribou, Cat, Crab, Crocodile, Dog, Elephant, Elk, Ferret, Fish, Fox, Frog, Fungus, Goat, Hamster, Hippo, Horse, Hyena, Insect, Jackal, Jellyfish, Leech, Leviathan, Lizard, Mole, Mongoose, Monkey, Mouse, Nautilus, Octopus, Otter, Ox, Oyster, Pangolin, Rabbit, Raccoon, Rat, Rhino, Sable, Salamander, Scorpion, Serpent, Shark, Sheep, Slug, Snake, Spider, Sponge, Squid, Squirrel, Starfish, Trilobite, Turtle, Walrus, Whale, Wolf, Wolverine, Wombat, and Worm.)
2/2

Fungus?

What about Wurm? It'd be funny to end on "…Worm, and Wurm.)"

I intentionally tried to only include real-world animals on the list, so no Wurms, Basilisks, Pegasus, Yeti, etc. You're right that Fungus is a stretch. Maybe Leviathans should come off too.

Sofina, Doom of Neverwinter
Legendary Creature — Zombie Wizard Advisor
Prowess, deathtouch
Whenever you cast an instant or sorcery spell, goad up to one target creature.
, : Destroy all other creatures. For each creature destroyed this way, create a 2/2 black Zombie creature token with decayed. Activate this ability only if all other creatures are tapped.
0/2

Helm of Disjunction
Legendary Artifact — Equipment
Equipped creature has protection from other artifacts and enchantments.
Equipped creature has ", Discard a card with mana value X: Destroy all artifacts and enchantments with mana value X."
Equip

Unicron, Planet-Eater
Legendary Artifact Land (M)
Indestructible
, Sacrifice another land: Add . Put a charge counter on Unicron.
: Convert Unicron. Activate this only if Unicron has three or more charge counters on it.
//TDFC//
Unicron, Lord of Chaos
Legendary Artifact Creature - Robot God (M)
Indestructible
As long as Unicron has less than 6 charge counters on it, it isn't a creature.
: Destroy target permanent. Put a charge counter on Unicron.
20/20

Back to Mirrodin/New Phyrexia?

Ja

Ablution in Oil
Sorcery
Put two oil counters on target artifact or creature. Then, for each oil counter on that permanent, it gains your choice of flying, lifelink, first strike, vigilance, toxic 1, or hexproof until end of turn.
"Our processes are still half as bloody as organic births and twice as sacred."

Janus, Speaker of the Synod
Legendary Creature — Vedalken Wizard
Each non-mana activated ability you activate costs less to activate for each artifact you control. This effect can’t reduce the mana in that cost to less than one mana.
, : You gain control of target artifact. If it's an Equipment, attach it to Janus.
1/4

Mephidross Lich
Artifact Creature - Zombie (R)
At the beginning of your upkeep, sacrifice an artifact.
Whenever another nontoken creature dies, create a colorless artifact token named Scrap.
Sacrifice an artifact: Mephidross Lich gains indestructible until end of turn.
Mirran corpses always leave behind useful parts.
5/3

The Martyrdom of Slobad
Enchantment — Saga
I - Sacrifice a creature. If you do, mill four cards. You may put up to one artifact card milled this way onto the battlefield.
II - Sacrifice a creature. If you do, add .
III - Sacrifice a creature. If you do, return target artifact or creature card from your graveyard to the battlefield. It gains indestructible and haste until your next turn.

Flak -
Instant
As an additional cost to cast this spell, sacrifice X artifacts.
Destroy X target creatures with flying.

Belaxis, Lost Aspirant
Legendary Creature — Phyrexian Elf Warrior
Belaxis, Lost Aspirant enters the battlefield with an oil counter.
Vigilance
, , Remove X oil counters from Belaxis and sacrifice it: Search your library for a creature card with mana value X or less. Put it onto the battlefield with X additional oil counters on it. It's a Phyrexian in addition to its other types.
1/1

Yawgmoth's Remnant —
Artifact Creature — Phyrexian Germ (R)
If you would proliferate, proliferate twice instead.
Germ tokens you control get +1/+1.
1/1

The White Lacuna
Artifact Land
The White Lacuna enters the battlefield tapped.
: Add .
, Put The White Lacuna on the bottom of its owner's library: Search your library for a card named Beacon of Immortality, reveal it, shuffle, then put that card on top.

Next is Kamigawa.

The Traitor Choryu and His Crimes
Enchantment — Saga
I, II - Tap target creature and put a stun counter on it.
III - Exile The Traitor Choryu and His Crimes, then return it to the battlefield transformed.

Condemnation of the Coward
Enchantment Creature — Human Wizard
When Condemnation of the Coward enters the battlefield, you gain control of target tapped creature as long as Condemnation of the Coward remains on the battlefield.
He failed his masters, first by losing the princess then by giving their name up. His greatest virtue was his failure allowed Michiko to continue her journey to end the war.
1/1

Boss Uramon
Legendary Creature — Human Rogue
Flash
Other Rogue, Ninja, and Assassin spells you cast have flash.
Whenever another Rogue, Ninja, or Assassin enters the battlefield under your control, surveil 1. If this is the third time this ability has resolved this turn, draw a card.
3/1

Akki Fault-Weaver
Creature - Goblin Wizard
Haste, Menace
When ~ enters the battlefield, each player sacrifices a permanent.
"The way the Akki can crack the earth with such precision and power, you'd think they were blessed with artistry from the Soratami themselves."
[2/1]

Kodama of Fallen Boseiju
Legendary Creature — Spirit
, Exile X land cards from your graveyard: Put an enchantment card with mana value X or less from your hand onto the battlefield.
All things remembered and honored persist on Kamigawa.
3/3

Call and Response
Enchantment — Saga
I, II - Create a 1/1 colorless Spirit creature token.
Splice onto Saga