Put target creature into its owner's library second from the top.
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10 months ago
Flusterstorm is pretty bad in EDH except in the highest tiers, TBH. I have a copy and I'm struggling to find a deck for it.
Looking at your description, here are some things that might interest you: Anchor to the Aether, Chronostutter, Ether Well, Forced Retreat, Grasp of Phantoms, Griptide, Metamorphose, Repel, Spin into Myth, Submerge, Sweep Away, Temporal Eddy, Whisk Away. There are also a million Control Magic effects, though they usually center around 5 mana (Mind Control, Treachery, Spirit Away, Volition Reins, etc).
You might also want a Braids, Conjurer Adept in here. It should help you get some of those big fatties out of your hand.
Happy deckbuilding! :)