Gilded Drake [Urza's Saga] Black Add an amount of {B}

Add an amount of {B} equal to the sacrificed creature's mana value

each other non-Aura enchantment you control is a creature in addition to its other types and has base power and base toughness each equal to its mana value

Vryn's Prodigy

Set: Kaladesh Prerelease Promos Type: Land Rarity: Rare Botanical Sanctum enters the battlefield tapped unless you control two or fewer other lands

Set: Dominaria Prerelease Promos Type: Legendary Enchantment Rarity: Rare Cost: {3}{B}{B}{B} Hexproof

Gilded Drake [Urza's Saga] Black Add an amount of {B}Set: Urza's Saga Type: Creature Drake Rarity: Rare Cost: {1}{U} Flying When Gilded Drake enters the battlefield, exchange control of Gilded Drake and up to one target creature an opponent controls. If you don't or can't make an exchange, sacrifice Gilded Drake. This ability still resolves if its target becomes illegal. Buyer beware.