Kessla, Master Thief

Whenever an opponent draws a card, if it’s not their turn, you may pay {1}. If you do, create a Clue token.

At the beginning of your end step, you may exile the top card of each opponent’s library. For as long as those cards remain exiled, you may play them, and you may spend mana as though it were mana of any color to cast them.

Whenever you sacrifice a token, put a +1/+1 counter on Kessla, Mastermind of Schemes. If it’s a Clue token,
draw a card.