Dalkovan Outrider 
Creature — Orc Warrior
Mobilize 2 Whenever you sacrifice a permanent, the topmost creature card in your library perpetually gets +1/+1.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL