Gixian Skullflayer 
Creature — Phyrexian Human Assassin
At the beginning of your upkeep, if there are three or more creature cards in your graveyard, put a +1/+1 counter on this creature.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL