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Moraug, Fury of Akoum (EOC) $8.06 Already a red staple in EDH, Moraug, Fury of Akoum wreaks havoc when the theme is extra combat steps

If you control a monster whose original name is "Obelisk the Tormentor": Negate the effects of 1 monster your opponent controls, and if you do, destroy it, also for the rest of the turn, negate the effects of monsters with the same original name as the destroyed monster, then if it is your main phase, destroy all Spells and Traps your opponent controls

What split cards are staples in your EDH decks

This is exactly what got it banned in Kaladesh Standard only a few months after its release