mtg leviathanthe dark Magic 2013 then you gain 1 life

then you gain 1 life for each permanent of that color

Set: Kaladesh Inventions Type: Artifact Creature — Thopter Rarity: Mythic Cost: {0} Flying

Activate only if you control a Sliver

sacrifice it unless you sacrifice any number of creatures with total power 12 or greater

Spend this mana only to cast a creature spell

mtg leviathanthe dark Magic 2013 then you gain 1 lifeSet: The Dark Type: Creature Leviathan Rarity: Rare Cost: {5}{U}{U}{U}{U} Trample Leviathan enters the battlefield tapped and doesn't untap during your untap step. At the beginning of your upkeep, you may sacrifice two Islands. If you do, untap Leviathan. Leviathan can't attack unless you sacrifice two Islands. (This cost is paid as attackers are declared.)