Koskun Falls [Homelands] BT9-015 When another face-up Dragon monster(s)

When another face-up Dragon monster(s) you control returns to your hand (except during the Damage Step): You can target 1 monster your opponent controls

Set: Dimensional Phase Card type: Digimon Rarity: Uncommon Digi type: Beastkin Play Cost: 7 Form: Ultimate Attribute: Vaccine Digivolve Cost: 3 Digivolve Cost Level: 4 [Raid] (When this Digimon attacks

Set: Time Spiral Type: Creature — Human Rebel Cleric Rarity: Common Cost: {W} Sacrifice Children of Korlis: You gain life equal to the life you've lost this turn

Set: Structure Deck: Wave of Light Card type: Effect Monster Rarity: Common Attack: 2400 Defense: 1800 While you draw a Fairy monster(s) (except during the Damage Step)

or 1 card that mentions it

Koskun Falls [Homelands] BT9-015 When another face-up Dragon monster(s)Set: Homelands Type: World Enchantment Rarity: Rare Cost: {2}{B}{B} At the beginning of your upkeep, sacrifice Koskun Falls unless you tap an untapped creature you control. Creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.