Blood Moon [Chronicles] 072 when your opponent activates a

when your opponent activates a Spell/Trap Card

Set: Legends Type: Sorcery Rarity: Rare Cost: {2}{B}{B} Exile All Hallow's Eve with two scream counters on it

Set: Unlimited Edition Type: Enchantment Rarity: Rare Cost: {3}{R} Whenever a player taps a land for mana

Once per turn: You can Tribute 1 "Mech Phantom Beast" monster

Set: XY: Base Set Type: Grass Rarity: Ultra Rare Retreat cost: Colorless

Blood Moon [Chronicles] 072 when your opponent activates aSet: Chronicles Type: Enchantment Rarity: Rare Cost: {2}{R} Nonbasic lands are Mountains. Heavy light flooded across the landscape, cloaking everything in deep crimson.