When Deathly Hub enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
Put Deathly Hub on top of your library: Add to your mana pool.
, : Add one mana of any color to your mana pool.
.
: Add or 
to your mana pool.
to your mana pool. , : Add one mana of any color to your mana pool.
