You are never forced to activate mana abilities to pay costs, so if there is a mandatory additional mana cost (such as from Thalia, Guardian of Thraben), you can decline to activate mana abilities to pay for it and hence fail to cast the suspended card, leaving it in exile
Whenever that creature deals combat damage to a player, its controller may cast a copy of the encoded card without paying its mana cost.) Watermark: Dimir Illustrated by James Ryman Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp
Cards that are useful early and late improve deck consistency giving better games
This list compensates for the loss of that face damage by playing a slightly more midrange game, accepting that games wont end quite as quickly
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That character cant quest during their next turn