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The ones most unique to this deck are any lands that cheaply and efficiently generate a creature to maximize Zada's trigger: Dwarven Mine is the best of the best here, being a Mountain that will almost always enter the battlefield and generate a creature for no mana cost

The Stairwell creates hoards of Zombies with haste all around the table every upkeep, which will likely die, helping Sephiroth flip and triggering his pings once hes in One-Winged Angel mode

Gravekeeper's Guard X DARK Level 4 [ SpellcasterFlipEffect ] ATK 1000 DEF 1900 FLIP: Target 1 monster your opponent controls

However, with the basic Swamp requirement, your mana base needs to be almost exclusively basic Swamps and Cabal Stronghold to really make Cabal Stronghold function, which probably isn't worth the cost in Modern, where splashing a second color and playing utility lands likely give you more power than maybe making extra mana with Cabal Stronghold, and it might not even be worth the cost in Standard

The giant monster often either gets there or it doesnt, with little else mattering