Dämonenfürst Belzenlok

Demonlord Belzenlok's ability causes it to deal an amount of damage to you all at once; it doesn't deal 1 damage multiple times.

If the mana cost of the nonland card includes {X}, X is considered to be 0.

If the nonland card doesn't have a mana cost, its mana value is 0.

Land cards exiled this way remain exiled.

Once the triggered ability resolves, the ability will continue until you either exile a nonland card with mana value 3 or less or fail to exile any nonland cards while performing the process. You can't choose to stop receiving the blessings of Demonlord Belzenlok any sooner.

The mana value of a split card, such as a card with aftermath from the Amonkhet block, is equal to the combined mana cost of its two halves.