Exile the top X cards of your library. You may cast an instant or sorcery spell with mana value X or less from among them without paying its mana cost. Then put the exiled instant and sorcery cards that weren't cast this way into your hand and the rest on the bottom of your library in a random order.
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Breena, the DemagogueExtended Art328 · mythic$21.96
Witch's ClinicExtended Art407 · rare$19.36
Thousand-Year Elixir271 · rare$17.67
Spawning KrakenExtended Art360 · rare$15.80
Veyran, Voice of DualityExtended Art330 · mythic$13.32
Adrix and Nev, TwincastersExtended Art336 · mythic$13.19
Spawning Kraken33 · rare$12.74
Witch's Clinic81 · rare$12.57
Gyome, Master ChefExtended Art332 · mythic$12.44
InkshieldExtended Art398 · rare$11.74
Seething Song179 · common$10.99
Alhammarret's Archive233 · mythic$10.78
Muse Vortex