From Under the Floorboards [Commander 2019] DP19 When this card destroys an

When this card destroys an opponent's monster by battle and sends it to the Graveyard: You can Special Summon that monster to your side of the field

Set: Urza's Saga Type: Instant Rarity: Common Cost: {U} Each player returns a creature they control to its owner's hand

Through years of study and training

where X is the amount of mana spent to cast it

Set: Sun & Moon: Burning Shadows Type: Water Rarity: Promo Retreat cost: Colorless

From Under the Floorboards [Commander 2019] DP19 When this card destroys anSet: Commander 2019 Type: Sorcery Rarity: Rare Cost: {3}{B}{B} Madness {X}{B}{B} (If you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.) Create three tapped 2 2 black Zombie creature tokens and you gain 3 life. If this spell's madness cost was paid, instead create X of those tokens and you gain X life.