Fountain Bosk enters the battlefield tapped unless you sacrifice a creature.
: Add or to your mana pool.
Put Fountain Bosk on top of your library: Add to your mana pool.
, , Sacrifice Fountain Bosk: Target player gets a poison counter.
: Add 
or 
to your mana pool.
to your mana pool. , , Sacrifice Fountain Bosk: Target player gets a poison counter.
