When Darkslick Shoal enters the battlefield, sacrifice it unless you pay 2 life.
: Add or to your mana pool.
Sacrifice Darkslick Shoal: Add or to your mana pool.
, : Target player puts the top card of his or her library into his or her graveyard.
: Add 
or 
to your mana pool. or to your mana pool., : Target player puts the top card of his or her library into his or her graveyard.
