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But he honestly could go into any deck that just wants some additional draw power and is confident that their card quality is going to be higher then their opponent's

Creatures with much higher mana values can suddenly spring up on your battlefield when you have nowhere near enough mana to normally cast it

Source: Comment on Reddit Build a shell that ramps hard (for Ornate Imitations) or and/or loops ETBs (for Fear of Change): Green mana rocks, ramp cards, Overlord of the Hauntwoods, or treasure to push to X = 9 quickly

Use the number of noncreature, nonland cards in your graveyard as Summon: Esper Ramuh's first chapter ability resolves to determine how much damage is dealt