Repeated Board Wipe

If a source would deal damage to a Cleric creature you control, prevent 1 of that damage.

As this enchantment enters, choose a creature type. Creatures you control are the chosen type. The same is true for creature spells you control and creature cards you own that aren't on the battlefield.

Each land is a Swamp in addition to its other land types.

All Swamps are 1/1 black creatures that are still lands.

At the beginning of the end step, if no creatures are on the battlefield, sacrifice this enchantment. : This enchantment deals 1 damage to each creature and each player.