Crocodile of the Crossing

Haste
When this creature enters, put a -1/-1 counter on target creature you control.

Moldering Karok

Baleful Ammit

Lifelink
When this creature enters, put a -1/-1 counter on target creature you control.

Crocanura

Reach (This creature can block creatures with flying.)
Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)

Volrath, the Shapestealer

At the beginning of combat on your turn, put a -1/-1 counter on up to one target creature.
{1}: Until your next turn, Volrath becomes a copy of target creature with a counter on it, except it's 7/5 and it has this ability.

Dukhara Scavenger

When this creature enters, you may put target artifact or creature card from your graveyard on top of your library.

Lurking Crocodile

Bloodthirst 1 (If an opponent was dealt damage this turn, this creature enters with a +1/+1 counter on it.)
Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Ammit Eternal

Afflict 3 (Whenever this creature becomes blocked, defending player loses 3 life.)
Whenever an opponent casts a spell, put a -1/-1 counter on this creature.
Whenever this creature deals combat damage to a player, remove all -1/-1 counters from it.

Catacomb Crocodile

Guul Draz Mucklord

When this creature dies, put a +1/+1 counter on target creature you control.

Kheru Dreadmaw

Defender
{1}{G}, Sacrifice another creature: You gain life equal to the sacrificed creature's toughness.

Grayscaled Gharial

Islandwalk (This creature can't be blocked as long as defending player controls an Island.)

Algae Gharial

Shroud (This creature can't be the target of spells or abilities.)
Whenever another creature dies, you may put a +1/+1 counter on this creature.