Grimgrin, Corpse-Born
{3}{U}{B}
Legendary Creature -- Zombie Warrior
5/5
~this~ enters tapped and doesn't untap during your untap step.
Sacrifice another creature: Untap ~this~ and put a +1/+1 counter on it.
Whenever ~this~ attacks, destroy target creature defending player controls, then put a +1/+1 counter on ~this~.
Leviathan
{5}{U}{U}{U}{U}
Creature -- Leviathan
10/10
Trample
~this~ enters tapped and doesn't untap during your untap step.
At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap ~this~.
~this~ can't attack unless you sacrifice two Islands. (This cost is paid as attackers are declared.)
Traxos, Scourge of Kroog
{4}
Legendary Artifact Creature -- Construct
7/7
Trample
~this~ enters tapped and doesn't untap during your untap step.
Whenever you cast a historic spell, untap ~this~. (Artifacts, legendaries, and Sagas are historic.)