Mordekaiser, Iron Revenant

Menace.
At the beginning of your upkeep remove all
dominion counters from Mordekaiser.
{3}{b}{b}: Put a dominion counter on Mordekiser.
He then fights target creature an opponent
controls. If the targeted creature is killed
Mordekaiser gets +X/+X until the start of your
next turn where X is the targeted creature's
power. Mordekaiser can't activate this ability if
he has at least 1 dominion counter.