(Dormant Plain isn't a spell.)
Dormant Plain enters the battlefield tapped.
, : Tap target artifact with converted mana cost X or less.
: Add to your mana pool. Dormant Plain doesn't untap during your next untap step.
, 
: Tap target artifact with converted mana cost X or less.: Add 
to your mana pool. Dormant Plain doesn't untap during your next untap step.
