(Tomb Clump isn't a spell.)
At the beginning of your end step, if you didn't cast any spells this turn, Tomb Clump deals 1 damage to you.
All creatures have Swampwalk.
: Add to your mana pool. Return Tomb Clump to its owner's hand.
: Add 
to your mana pool. Return Tomb Clump to its owner's hand.
