Abyssal Onslaught

Sacrifice X creatures you control. For each creature sacrificed this way, Abyssal Onslaught deals 2 damage to up to X target creatures or players.
Fateful hour - If you have 5 or less life, deal 4 damage for each creature sacrificed instead.
"Our aircraft...will blot out...the sun, and our shells...
will turn the ocean into...a sea of flame! You will
sink!" - Abyssal Princess