(Barbarian Clump isn't a spell.)

At the beginning of your end step, if you didn't cast any spells this turn, Barbarian Clump deals 1 damage to you.

Barbarian Clump is indestructible. (Destroy effects and lethal damage don't destroy it.)

: Add  to your mana pool. Barbarian Clump doesn't untap during your next untap step.