Psylocke, Peerless Combatant

Haste, double strike, ward — discard a card
Whenever Psylocke attacks, the defending player reveals cards from the top of their library until
they reveal a nonland card. That player exiles
that card, then puts the remaining cards on the
bottom of their library. You may cast that card
for as long as it remains exiled, and you may
spend mana as though it were mana of any color
to cast it.
When a spell is cast from exile, you may exile a
card from a graveyard.