Raging River [Alpha Edition] Mirrodin cast it without paying its

cast it without paying its mana cost

Set: Worldwake Type: Legendary Creature — Merfolk Rogue Rarity: Rare Cost: {1}{U}{U} Islandwalk (This creature can't be blocked as long as defending player controls an Island

Set: Invasion Type: Sorcery Rarity: Rare Cost: {1}{B} Separate all creatures target player controls into two piles

sacrifice Koskun Falls unless you tap an untapped creature you control

each player may put a permanent card from their hand onto the battlefield

Raging River [Alpha Edition] Mirrodin cast it without paying itsSet: 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.