Wizened Githzerai 
Creature — Gith Monk
Psionic Adept — Whenever Wizened Githzerai becomes blocked by a creature, that creature perpetually gets -2/-0.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL