Misdirection on thoughtseize

[Secretly.A.Bee]

If I cast Thoughtseize and my opponent plays misdirection who gets to choose what card is discarded from my hand?

Thanks for your help.

-ABC

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[syfilisx]

Controller/Caster of spell chooses

[Secretly.A.Bee]

Thank you.

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[apple713]

other useful information...

the hand is revealed to all players

The player casting thought seize MUST choose a card to discard and cannot "fail to find"