Angelic Favor Aura of Dominion Bramblesnap Collective Effort Dragonbroods' Relic Earthcraft Field Surgeon Glare of Subdual Hair-Strung Koto Heirloom Epic Holdout Settlement Hollow Warrior Jaspera Sentinel Keldon Battlewagon Koskun Falls Kyren Negotiations Lashknife Llanowar Behemoth Loam Dryad Maro Avatar Mothdust Changeling Opposition Orim's Cure Purple Pentapus Ramosian Rally Revelsong Horn Saruli Caretaker Scene of the Crime Selesnya Evangel Sivvi's Valor Springleaf Drum Survivors' Encampment Swallow Whole T.A.P.P.E.R
Adaptive Automaton Banner of Kinship Basilisk Collar Celestial Armor Crystal Barricade Cultivator's Caravan Gilded Lotus Leyline Axe Mazemind Tome Scrawling Crawler Solemn Simulacrum Steel Hellkite Wishclaw Talisman
(If a creature with a finality counter on it would die, exile it instead.) Enchantment Recursion (CTRL to add secondary) Removal Bronzebeak Foragers When this creature enters, for each opponent, exile up to one target nonland permanent that player controls until this creature leaves the battlefield
Megatron, Tyrant triggers after combat, turning all that damage into extra colorless mana and allowing you to recast more artifacts as fodder for the newly-converted Megatron, Destructive Force
For example, a card like Elesh Norn can totally shut down aggro but is near-useless against a deck that's going to combo-kill you with sorceries next turn
As is, it's an expensive removal spell with an effect that has just as mich downside as upside, and this kind of thing even with upside isn't always useful