Wyll of the Elder Pact 
Legendary Creature — Human Warlock
When this creature specializes, you may sacrifice another creature or an artifact. When you do, return target instant or sorcery card from your graveyard to your hand.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL