Retainer of Bolas

At the beginning of your end step, choose one
that hasn't been chosen—
• Retainer of Bolas deals 3 damage to target
creature or planeswalker.
• Each opponent discards a card.
• Return Retainer of Bolas to its owner's hand.
In some dark corners of the multiverse, Bolas's
followers mourn the fall of their God-Pharaoh and
spread tyranny in his memory.