That made good answers hard to come by while the Sliver deck was functioning as intended, as winning combats was hard, winning them quickly without trample was even harder, and removal was temporary
Gardevoir ex is shown with a movement quality to her illustration by Kuroimori for the Special Illustration Rare's scene
By paying one generic and one Red mana, you can reveal at random one of those cards and have Volatile Chimera become a copy of that card (retaining this ability as well)
Now your control deck can contest the early board with some basic blockers and spot removal, bank up the energy they generate, and cast a two-mana Wrath of the Skies that hits like you paid five mana
I made a few cuts simply based on mana cost, including Sepulchral PrimordialSepulchral Primordial, Explosion of RichesExplosion of Riches, Magmatic ForceMagmatic Force, Deadly TempestDeadly Tempest, Sunbirds InvocationSunbirds Invocation, and Scythe SpecterScythe Specter