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Mew and Mewtwo

Having access to cards that can remove Necro such as Nevinyrral's Disk with it is nice so you can recommence drawing when your life total is getting low or just after a complete hand refill in the mid to late game

Others lean into lifegain, hatebears, or heavy board control

Rooms were designed in such a way that you can use either half without wasting the other, so feel free to run out the Sauna on turn 5 and snipe something down with the Furnace later, or vice versa

Constantly revisiting Chapter I of Elspeth Conquers Death, The Akroan War, The Eldest Reborn, or Kiora Bests the Sea God will feel quite potent

Summary Lost Caverns of Ixalan set features unique valuable cards widely used in many formats