Terthameth, Immortal Sin

Flying Hexproof Vigilance Menace
When Terthameth, Immortal Sin enters the battlefield,
return all non-Demon creatures to their player's hands.
After that, add a +1/+1 marker to any creature you
control for each Demon you played.
{t}{r}{b/r}- Deal 7 damage to any two creatures, if one
of them is an Angel, destroy it. After that, exile this creature.