Duo, the Merciless

Flying, Vigilance, Lifelink

At the beginning of your end step, create an XP token for each spell cast this turn. (It's a colorless artifact with "{3}, Sacrifice this artifact: Scry 1, then draw a card, or put two +1/+1 counters on up to one target creature.")

Sacrifice five XP tokens: Return up to three target creatures to their owners hands.

{x}{w}{u}{b}{r}{g}, {t}, Sacrifice X XP tokens: Duo deals X damage to up to X targets.