(Brush-Pools isn't a spell.)
Brush-Pools enters the battlefield tapped unless you pay .
, : Tap target artifact with converted mana cost X or less.
: Add to your mana pool. Return Brush-Pools to its owner's hand.
.
, 
: Tap target artifact with converted mana cost X or less.: Add 
to your mana pool. Return Brush-Pools to its owner's hand.
