(Hickory Scrub isn't a spell.)
Hickory Scrub enters the battlefield tapped unless you sacrifice a basic land.
Islands don't untap during their controllers' untap steps.
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
: Add 
to your mana pool.: Add 
or 
to your mana pool. Each opponent gains 1 life.
