Slaughter Pact (Invocation) [Amonkhet Invocations] Leviathan its power and toughness are

its power and toughness are each equal to the number of Forests defending player controls

Set: Lorwyn Type: Sorcery Rarity: Rare Cost: {B} Target player reveals their hand

look at the top four cards of your library

Set: Arabian Nights Type: Creature — Fish Rarity: Rare Cost: {4}{U}{U}{U} Island Fish Jasconius doesn't untap during your untap step

Whenever a creature dealt damage by Sengir Vampire this turn dies

Slaughter Pact (Invocation) [Amonkhet Invocations] Leviathan its power and toughness areSet: Amonkhet Invocations Type: Instant Rarity: Mythic Cost: {0} Destroy target nonblack creature. At the beginning of your next upkeep, pay {2}{B}. If you don't, you lose the game.