Underworld Breach [Theros Beyond Death] BW46 Whenever Prowl attacks

Whenever Prowl attacks

return it to the battlefield under its owner's control with a +1/+1 counter on it

You may cast any number of the copies without paying their mana costs

If a spell cast this way would be put into a graveyard

Underworld Breach [Theros Beyond Death] BW46 Whenever Prowl attacksSet: Theros Beyond Death Type: Enchantment Rarity: Rare Cost: {1}{R} Each nonland card in your graveyard has escape. The escape cost is equal to the card's mana cost plus exile three other cards from your graveyard. (You may cast cards from your graveyard for their escape cost.) At the beginning of the end step, sacrifice Underworld Breach.