(Madblind Tubes isn't a spell.)
Madblind Tubes enters the battlefield tapped unless you pay 1 life.
, : Tap target artifact with converted mana cost X or less.
: Add or to your mana pool.
: Add to your mana pool. Put Madblind Tubes on top of your library.
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, 
: Tap target artifact with converted mana cost X or less.
or 
to your mana pool.
to your mana pool. Put Madblind Tubes on top of your library.
