(Dormant Hub isn't a spell.)
When Dormant Hub enters the battlefield, sacrifice it unless you pay 1 life.
, : Tap target artifact with converted mana cost X or less.
, Pay 1 life: Add or to your mana pool.
, , Sacrifice Dormant Hub: Draw a card.
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, 
: Tap target artifact with converted mana cost X or less.
or 
to your mana pool.
, 
