
Devoid (This card has no color.)
Whenever you cast an Eldrazi spell, you may pay . If you do, copy all spells you control, then copy all other activated and triggered abilities you control. You may choose new targets for the copies. (Mana abilities can't be copied.)
Ramp hard into colorless mana, then deploy Ulalek and cast Eldrazi spells, paying each time to copy every spell and ability you control. Each Eldrazi cast doubles your cast triggers, ETB effects, and any spells on the stack, snowballing into lethal Annihilator beats, drawn cards, or a game-ending loop. You're a five-color goodstuff Eldrazi/big-mana deck that grinds value until one cast turns into a blowout.
Lean into more colorless ramp—Ancient Tomb, Eldrazi Temple, and fast rocks—so you can reliably pay the tax on the turn you cast Eldrazi. Add high-impact cast/ETB Eldrazi and modal spells that gain the most from copying, plus tutors like Demonic Tutor and Eladamri's Call to assemble your engine. Tighten the manabase with fetches, duals, and creature-based ramp so a five-color deck still casts colored interaction without choking your colorless needs.
Played-with rates from 2 Mythicwyrm decks.
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
→ Infinite colorless mana, Infinite copies of abilities you control on the stack, Infinite copies of a specific creature
→ Infinite copies of abilities you control on the stack, Infinite creature tokens, Infinite death triggers
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
→ Infinite LTB, Infinite ETB, Infinite sacrifice triggers
Combos via Commander Spellbook.
Same color identity (BGRUW), by popularity.