Marcentaur

Vigiliance, Haste, Trample
{p/c}{p/c}: First Strike until end of turn
When Marcentaur is summoned or attacks.
Any-one has to say "Oh Hi Marc!" at an instans,
or they have to sacrifice a Creature and a Land
Marcentaur gets a +1/+1 counter for each
player who forgets this.
Marcentaur returns to its owner hand if he gets
exiled or destroyed by spells or abilities.