And then we stumbled onto the mental domination flavor
Reckless Bushwhacker Convoke Game-Ender Reckless Bushwhacker was at one point a meta-relevant card in the Modern and Pioneer formats, acting as a game-ender by casting it with its surge cost to give all your creatures haste to swing and win with one attack

Advanced Search Sets Random Syntax Atogatog Begin the Invasion Call the Spirit Dragons Child of Alara Chromanticore Coalition Victory Conflux Cosmic Spider-Man Cromat Fusion Elemental Garth One-Eye Genju of the Realm Heroes in a Half Shell Horde of Notions Infinite Guideline Station Invasion of Alara Iridian Maelstrom Jared Carthalion Jodah, the Unifier Jodah, the Unifier Karona, False God Last Stand Leyline of the Guildpact Maelstrom Archangel Maelstrom Nexus Marina Vendrell Mass of Mysteries Meeting of the Five Niv-Mizzet Reborn Niv-Mizzet, Guildpact Niv-Mizzet, Supreme O-Kagachi, Vengeful Kami Omnath, Locus of All Primeval Spawn Progenitus Reaper King Rukarumel, Biologist Sanctum of All Scion of the Ur-Dragon Scions of the Ur-Spider Sliver Gravemother Sliver Hivelord Sliver Legion Sliver Overlord Sliver Queen The First Sliver The Kami War The Prismatic Bridge The Ur-Dragon Tiamat Tom Bombadil Two-Headed Hellkite Unite the Coalition Urza, Academy Headmaster

You also get experience, which counts towards your player level, which, when it goes up one, offers you more rewards in Pack Hourglasses and the like for, you guessed it, opening more packs
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Instant is lovely too on a card like this