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But that casting cost, boo

This card could still see some play though, as I don't think discard decks are going away any time soon

However, the wording means that it gets the buff only while the challenge is happening

Izzet Prowess (21.1% of the Winner's Metagame) 7 Island 4 Riverpyre Verge 4 Spirebluff Canal 4 Steam Vents 4 Burst Lightning 4 Flow State 4 Opt 4 Sleight of Hand 4 Boomerang Basics 4 Stormchaser's Talent 4 Slickshot Show-Off 3 Eddymurk Crab 2 Multiversal Passage 2 Spell Pierce 1 Vibrant Outburst 2 Colorstorm Stallion 1 Roaring Furnace // Steaming Sauna 1 Impractical Joke 1 Bounce Off 2 Ral, Crackling Wit 2 Soul-Guide Lantern 1 Get Out 1 Colorstorm Stallion 1 Broadside Barrage 1 Spell Pierce 1 Sear 1 Eddymurk Crab 1 Annul 1 Negate 1 Slagstorm 1 Pyroclasm 1 Flashfreeze Izzet Prowess remains the deck to beat in Standard, commanding 21.1% of the winner's metagame

Two have been added to the previous six