Commander Liara Portyr [Commander Legends: Battle for Baldur’s Gate]

Whenever you attack, spells you cast from exile this turn cost {X} less to cast, where X is the number of players being attacked. Exile the top X cards of your library. Until end of turn, you may cast spells from among those exiled cards.

“It’s a ghoul-eat-you world out there. Follow my orders if you want to survive.”