Cavern of Souls [Ultimate Masters] Morningtide The mind can only expand

The mind can only expand so far before it flies apart

Set: Odyssey Type: Enchantment Rarity: Uncommon Cost: {2}{R} Whenever a player taps a land for mana

"Just the thing for those pesky water mages

Ally of Zendikar becomes a 5/5 Human Soldier Ally creature with indestructible that's still a planeswalker

Set: Planechase Planes Type: Plane — Dominaria Rarity: Common Instant and sorcery cards in graveyards have flashback

Cavern of Souls [Ultimate Masters] Morningtide The mind can only expandSet: Ultimate Masters Type: Land Rarity: Mythic As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {C}. {T}: Add one mana of any color. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.