(Tomb Karst isn't a spell.)
At the beginning of your upkeep, Tomb Karst deals 2 damage to target creature you control.
, : Tap target artifact with converted mana cost X or less.
: Add to your mana pool. Return Tomb Karst to its owner's hand.
, 
: Tap target artifact with converted mana cost X or less.: Add 
to your mana pool. Return Tomb Karst to its owner's hand.
