When Mountain Scrub enters the battlefield, sacrifice it unless you pay 3 life.
: Add or to your mana pool.
: Add to your mana pool. Put Mountain Scrub on top of your library.
, Sacrifice Mountain Scrub: Add to your mana pool.
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: Add 
or 
to your mana pool.
to your mana pool. Put Mountain Scrub on top of your library.
