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This is perfect if a strong character is heavily damaged, has a benefit to being banished, or you are simply low on cards

additionally, it also fixes your mana when needed

Summons needed to feel important, powerful, and like they could turn the tides of battle before vanishingjust like in the games

In a deck that can go wide on the board, as Knights certainly can, this ability is incredibly dangerous, and can easily finish an opponent off in conjunction with other board-buff effects such as History of Benalia

Silumgar, the Drifting Death [Dragon]: One of the better dragons

If Primeval Spawn would enter the battlefield and it wasnt cast or no mana was spent to cast it, exile it instead makes it so you cant Reanimate, Sneak Attack or Polymorph it into existence and this design choice feels very deliberate