Robo-

At the beginning of each end step, if an artifact entered the battlefield under your control this turn,
Augment {2} ({2}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Wild Crocodile

When this creature enters the battlefield, search your library for a basic land card, reveal it, put it into your hand, then shuffle.

Crafty Octopus

When this creature enters the battlefield, this creature assembles a Contraption. (Put the top card of your Contraption deck face up onto one of your sprockets.)

Half-Shark, Half-

At the beginning of your upkeep,
Augment {5}{U} ({5}{U}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Multi-Headed

At the beginning of each end step, if you rolled a die this turn,
Augment {4}{G} ({4}{G}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Ordinary Pony

When this creature enters the battlefield, you may exile target non-Horse creature you control that wasn't put onto the battlefield with this ability this turn, then return it to the battlefield under its owner's control.

Dr. Julius Jumblemorph

Dr. Julius Jumblemorph is every creature type (even if this card isn't on the battlefield).
Whenever a host enters the battlefield under your control, you may search your library and/or graveyard for a card with augment and combine it with that host. If you search your library this way, shuffle.

Mer Man

When this creature enters the battlefield, you may draw a card.

Gemrazer

Mutate {1}{G}{G} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Reach, trample
Whenever this creature mutates, destroy target artifact or enchantment an opponent controls.

Ninja

You may activate Ninja's augment ability any time you could cast an instant.
Whenever this creature deals combat damage to a player,
Augment {2}{B} ({2}{B}, Reveal this card from your hand: Combine it with target host. Augment only as—oh, never mind.)

Clever Combo

Search your library for a host card or a card with augment, reveal it, put it into your hand, then shuffle.

Auspicious Starrix

Mutate {5}{G} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, exile cards from the top of your library until you exile X permanent cards, where X is the number of times this creature has mutated. Put those permanent cards onto the battlefield.

Really Epic Punch

Target creature you control gets +2/+2 if it's a host or has augment. Then it fights target creature you don't control.

Surgeon General Commander

Whenever you augment, enchant, or mutate a creature you control, draw a card.
{T}: Add {W}, {U}, {B}, {R}, or {G}.

Bat-

Flying
At the beginning of each end step, if an opponent lost 3 or more life this turn,
Augment {1}{B} ({1}{B}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Zombified

{4}{B}: Combine Zombified from your graveyard with target host.
{2}{B}, Exile a creature card from your graveyard:
Augment {4}{B} ({4}{B}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Monkey-

Whenever a nontoken creature you control dies,
Augment {2}{G} ({2}{G}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Strutting Turkey

When this creature enters the battlefield,
exile target creature card with mana value 2 or less from your graveyard. If it has augment, combine it with a host you control. Otherwise, put it onto the battlefield.

Serpentine

Landfall — Whenever a land enters the battlefield under your control,
Augment {2}{G} ({2}{G}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Adorable Kitten

When this creature enters the battlefield, roll a six-sided die. You gain life equal to the result.

Half-Kitten, Half-

Whenever you're dealt damage,
Augment {2}{W} ({2}{W}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Stinging Scorpion

When this creature enters the battlefield, target creature an opponent controls gets -1/-1 until end of turn.

Feisty Stegosaurus

When this creature enters the battlefield, roll a six-sided die. This creature deals damage equal to the result to target creature an opponent controls.

Success!

Target creature gets +2/+2 until end of turn. If it's a host or has augment, it gains lifelink until end of turn.

Dirty Rat

When this creature enters the battlefield, target opponent discards a card.

Eager Beaver

When this creature enters the battlefield, you may untap target permanent.

Voracious Vacuum

When this creature enters the battlefield, put a +1/+1 counter on target creature.

Archipelagore

Mutate {5}{U} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Whenever this creature mutates, tap up to X target creatures, where X is the number of times this creature has mutated. Those creatures don't untap during their controller's next untap step.

Shaggy Camel

When this creature enters the battlefield, creatures you control get +1/+1 until end of turn.

Teacher's Pet

{2}{W}, Sacrifice Teacher's Pet: Search your library for a card with augment, combine it with target host you control, then shuffle.

Angelic Rocket

Flying
When this creature enters the battlefield, you may destroy target nonland permanent.

Gnome-Made Engine

When this creature enters the battlefield, create a 1/1 colorless Gnome artifact creature token.

Numbing Jellyfish

When this creature enters the battlefield, roll a six-sided die. Target player mills X cards, where X is the result.

Dirge Bat

Mutate {4}{B}{B} (If you cast this spell for its mutate cost, put it over or under target non-Human creature you own. They mutate into the creature on top plus all abilities from under it.)
Flash
Flying
Whenever this creature mutates, destroy target creature or planeswalker an opponent controls.

Half-Squirrel, Half-

Whenever a nontoken creature enters the battlefield,
Augment {G} ({G}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Common Iguana

When this creature enters the battlefield, you may discard a card. If you do, draw a card.

Steam-Powered

{5}:
Augment {4} ({4}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Big Boa Constrictor

When this creature enters the battlefield, roll a six-sided die. Target opponent loses life equal to the result.

Mother Kangaroo

When this creature enters the battlefield, roll a six-sided die. Put a number of +1/+1 counters on this creature equal to the result.

Rhino-

Whenever this creature blocks,
Augment {3}{W} ({3}{W}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Half-Orc, Half-

Trample
At the beginning of each end step, if an opponent was dealt damage this turn,
Augment {1}{R}{R} ({1}{R}{R}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)

Labro Bot

When this creature enters the battlefield, return target host card or card with augment from your graveyard to your hand.

Humming-

Flying
Whenever you attack with two or more creatures,
Augment {3}{W} ({3}{W}, Reveal this card from your hand: Combine it with target host. Augment only as a sorcery.)