(: Add or to your mana pool.)
Havenwood Cairns enters the battlefield tapped unless you sacrifice a land.
, : Target green creature gets +2/+2 until end of turn.
, Sacrifice a Swamp: Add to your mana pool.
: Add 
or 
to your mana pool.)
, : Target green creature gets +2/+2 until end of turn., Sacrifice a Swamp: Add to your mana pool.
