Double strike (This creature deals both first-strike and regular combat damage.) Magecraft — Whenever you cast or copy an instant or sorcery spell, return target nonlegendary creature card from your graveyard to your hand.

As an additional cost to cast this spell, you may sacrifice any number of creatures. This spell costs less to cast for each creature sacrificed this way. Each opponent sacrifices a creature. Create a 3/6 black and red Avatar creature token with haste (This creature can attack, and as soon as it comes under your control.) and "Whenever this creature attacks, it deals 3 damage to each opponent."