Raging River [Alpha Edition] Exodus Set: Legends Type: Sorcery Rarity:

Set: Legends Type: Sorcery Rarity: Rare Cost: {X}{X}{U} Discard X cards

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

the player can activate mana abilities only if they're from lands that player controls and only if mana they produce is spent to activate other mana abilities of lands the player controls and/or to play that card

If Cosmic Horror is destroyed this way

Raging River [Alpha Edition] Exodus Set: Legends Type: Sorcery Rarity:Set: Alpha 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.