Ob Nixilis, the Fallen [The List] Nightmare Sphinx each planeswalker you control becomes

each planeswalker you control becomes a 4/4 red Dragon creature and gains flying

Set: The List Type: Artifact Rarity: Rare Suspend 3—{0} (Rather than cast this card from your hand

Set: World Championship Decks 2001 Type: Instant Rarity: Rare Cost: {1}{U} Counter target spell or ability an opponent controls that targets a land you control

And if there's a route worth taking

Set: Commander Anthology Volume II Type: Legendary Creature — Kraken Rarity: Mythic Cost: {3}{U}{U}{B} Islandwalk

Ob Nixilis, the Fallen [The List] Nightmare Sphinx each planeswalker you control becomesSet: The List Type: Legendary Creature Demon Rarity: Mythic Cost: {3}{B}{B} Landfall Whenever a land enters the battlefield under your control, you may have target player lose 3 life. If you do, put three +1 +1 counters on Ob Nixilis, the Fallen. His spark lost, he plots revenge upon the plane whose corrupting mana fractured his soul.