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: Choose target enchantment you control that doesn't have the same name as another permanent you control. Create a token that's a copy of it, except it isn't legendary. If the token is an Aura, untap Yenna, then scry 2. Activate only as a sorcery.
Yenna turns your enchantments into an engine: tap her to copy a non-duplicate enchantment, and if it's an Aura you untap her, scry 2, and can copy again. You ramp into enchantments, deploy value Auras and powerful enchantments, then chain copies to snowball board state, card advantage, or game-ending value before swinging or comboing out.
Add untap enablers and mana-positive Auras (Utopia Sprawl, Wild Growth, Fertile Ground) plus a mana-doubler to enable infinite-mana loops with Yenna's Aura untap. Tighten the mana base with more two-mana ramp and enchantment tutors (Enlightened Tutor, Idyllic Tutor), and include protection like Heroic Intervention and Teferi's Protection to survive wipes. Finally, add a clean infinite-mana payoff such as Walking Ballista or Finale of Devastation to convert your engine into a guaranteed win.
The most-played cards for this commander, built from aggregated deck data (the Mythic Graph). Build public decks to seed it.
→ Infinite LTB, Infinite ETB, Infinite colored mana
→ Infinite copies of tokens you control, Infinite creature tokens, Infinite ETB
→ Infinite copies of a specific enchantment
→ Infinite death triggers, Infinite ETB, Infinite LTB
→ Creatures can't attack, Lock
Combos via Commander Spellbook.
Same color identity (GW), by popularity.