Could Discover Allow Me to Cast a Non-instant on My Opponent's Turn
That said, she does make attacking a bit more advantageous with the lifelink since it can keep you in the clear while some of your creatures tread between the graveyard and your hand

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What sleeves fit MTG cards
(9/19/2025) The creature you return must be tapped at the time you pay costs, but doesn't necessarily need to be tapped before you start casting the spell