Leviathan [The Dark] Theros each opponent sacrifices a creature

each opponent sacrifices a creature

Set: Legends Type: Enchantment Rare Cost: {2}{W}{W} Creatures without flying can't attack

you may return Bloodghast from your graveyard to the battlefield

If Gemstone Caverns has a luck counter on it

Set: Commander's Arsenal Type: Enchantment Rare Cost: {3}{G}{W} Creatures you control get +1/+1

Leviathan [The Dark] Theros each opponent sacrifices a creatureSet: The Dark Type: Creature Leviathan 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.)