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Until there's a more recent reprint of Fling in a Standard set, the card itself is legal in pretty much any non-rotating format

Behemoth Sledge Blue Mage's Cane Champion's Helm Colossus Hammer Conformer Shuriken Conqueror's Flail Dancer's Chakrams Darksteel Plate Explorer's Scope Fishing Gear Hero's Blade Hero's Heirloom Lightning Greaves Mask of Memory Reaper's Scythe Skullclamp Summoning Materia Swiftfoot Boots Sword of the Animist Trailblazer's Boots Wrecking Ball Arm

Especially when Alesha gets larger, and the mana cost available grows in tandem, giving all creatures infinite lives as long as the player keeps attacking

Both of these colors struggle against control cards