Couldn't cast Karns temporal sundering
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moore1420#40970
shared this idea
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Rezzahan#77802
commented
Legendary instants and sorceries require you to have a legendary creature or planeswalker on the field to cast them. That's the rules for them.
So for example, if you had your Y'sthola on the field, you could cast the spell. Doesn't have to be your commander, though. ANY legendary creature or planeswalker will do. Even having a usually nonlegendary creature as your Ringbearer on the field will do.