one piece op12 booster box One Piece OP-12 Legacy of the Master Booster Pack (Japanese)

126+1 card types in total

1 Darksteel Mutation

Combos Hullbreaker Horror | Sol Ring | Lotus Petal: Infinite colorless mana and storm count Underworld Breach | Lotus Petal | Brain Freeze: Infinite self-mill and near-infinite magecraft triggers Dualcaster Mage | Twinflame: Infinite magecraft triggers and creature tokens with haste Dualcaster Mage | Heat Shimmer: Infinite magecraft triggers and creature tokens with haste Bolas's Citadel | Sensei's Divining Top | Aetherflux Reservoir: Near-infinite lifegain, damage, and storm count Tainted Pact | Thassa's Oracle: Win the game Demonic Consultation | Thassa's Oracle: Win the game Underworld Breach | Frantic Search | Dragon's Rage Channeler: | Thassa's Oracle or Bolas's Citadel: Win the game Essence Flux | Dualcaster Mage: Infinite ETB, Infinite LTB

Combined with Chulane's ability, if you've got five mana worth of mana-producing creatures, you can then churn through your entire deck to find whatever piece you may need