Mai Shoko, Breaker Agent

Whenever an unblocked creature you control
deals combat damage to a player, that player exiles
the top card of their library. You may cast cards
exiled in this way, and you may spend mana as
though it were mana of any color to do so.
Whenever you cast a card from exile, choose one
that hasn't been chosen yet this turn:
• Each opponent loses 2 life, and you gain 2 life.
• Draw two cards, then discard a card.
• Create two tapped treasure tokens.