Brrrum, World Killer

Indestructible

When Brrrum, World Killer, enters the battlefield, you
may pay 10 life. Then, if you paid life this way, destroy all creatures. They can't be regenerated.

If one or more creature cards would go to an opponents graveyard, instead put them into your own graveyard.

Brrrum, World Killer's power and toughness is equal to
the amount of creature cards in your graveyard