Karn's Temporal Sundering unable to cast
I am unable to cast Karn's Temporal Sundering even with enough mana and even with the opponent not having hexproof on them or their creatures or even protection from blue except for one creature.
2
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Bfox#00431
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[Deleted User] commented
Legendary instants and sorceries need a legendary creature or planeswalker on the field under your control to be cast.