Tainted Aether [Urza's Saga]Set: Urza's Saga Type: Enchantment Rarity: Rare Cost: {2}{B}{B} Whenever a creature enters the battlefield, its controller sacrifices a creature or land. Gix despised the sylvan morass. The gouge that the portal had torn in the forest was the only pleasing sight.

"We have been patient

Whenever a creature enters the battlefield under an opponent's control

Set: Unlimited Edition Type: Land — Forest Island Rarity: Rare ({T}: Add {G} or {U}

Whenever another creature enters the battlefield

At the beginning of the end phase

Set: Diamond & Pearl: Legends Awakened Type: Lightning Rarity: Holo Rare

but how could that be

Set: XY: BREAKthrough Type: Fire Rarity: Holo Rare Retreat cost: Colorless

Set: Commander's Arsenal Type: Enchantment Rarity: Common Cost: {2}{U} Whenever an opponent casts a spell

you lose 1 life and create a 1/1 black Faerie Rogue creature token with flying

Set: EX: Crystal Guardians Type: Grass Rarity: Holo Rare Retreat cost: Colorless

To our horror