Wyll of the Fiend Pact

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.

When this creature specializes, you may sacrifice another creature or an artifact. If you do, Wyll of the Fey Pact perpetually gets +3/+3 and gains trample.

When this creature specializes, you may sacrifice another creature or an artifact. If you do, untap Wyll of the Blade Pact. After this main phase, there is an additional combat phase followed by an additional main phase.

When this creature specializes, you may sacrifice another creature or an artifact. When you do, return target creature card from your graveyard to the battlefield. It gains haste. If its mana value is 4 or greater, sacrifice it at the beginning of your next end step.

Whenever this creature attacks, you may sacrifice another creature or artifact. If you do, draw a card and put a +1/+1 counter on this creature.

When this creature enters, you may sacrifice an artifact or creature. When you do, exile target creature an opponent controls.