Rockslide Ambush [Portal Three Kingdoms] Dragon you may pay {U} rather

you may pay {U} rather than pay this spell's mana cost

Set: Starter 1999 Type: Instant Rarity: Common Cost: {1}{U} Counter target creature spell

Set: Classic Sixth Edition Type: Artifact Rarity: Rare Cost: {2} Activated abilities of creatures can't be activated

Set: Mirrodin Besieged Type: Creature — Phyrexian Gremlin Rarity: Common Cost: {1}{B} Infect (This creature deals damage to creatures in the form of -1/-1 counters and to players in the form of poison counters

Set: Avacyn Restored Type: Creature — Devil Rarity: Uncommon Cost: {5}{R} When Gang of Devils dies

Rockslide Ambush [Portal Three Kingdoms] Dragon you may pay {U} ratherSet: Portal Three Kingdoms Type: Sorcery Rarity: Uncommon Cost: {1}{R} Rockslide Ambush deals damage to target creature equal to the number of Mountains you control.