Raging River (Retro) [30th Anniversary Edition] Urza's You may spend mana as

You may spend mana as though it were mana of any type to cast creature spells

Encounter a horrific assortment of creatures from the monstrous bestiary

and ultimately declared “Founder of Skyward”

Will gasped as Rowan drew from the raw power of the Strixhaven Snarl

Raging River (Retro) [30th Anniversary Edition] Urza's You may spend mana asSet: 30th Anniversary Edition Type: Enchantment Rarity: Rare Cost: {R}{R} Whenever one or more creatures you control attack, each defending player divides all creatures without flying they control into a "left" pile and a "right" pile. Then, for each attacking creature you control, choose "left" or "right." That creature can't be blocked this combat except by creatures with flying and creatures in a pile with the chosen label.