In the case of a cast-from-exile strategy (yes, Im talking about Prosper, Tome-Bound once again, bear with me) you have tons of possible cards, especially in red
Ixhel comes built-in with an alternate win condition, allowing you to poison out an opponent with its toxic 2 ability, and once a player hits ten poison counters, they're automatically out of the game, making it, so you only have to connect with a player five times to completely poison them out
The deck could also stand to lose land, and we'll pick Terramorphic Expanse since the deck already has Evolving Wilds as well as several other crack lands
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(2022-06-10) You must still follow any relevant timing rules for the permanent spell you cast from exile