When Cave Swamp enters the battlefield, sacrifice it unless you pay 1 life.
: Add or to your mana pool.
Sacrifice Cave Swamp: Add or to your mana pool.
, : Target Elemental gets +2/+0 until end of turn.
: Add 
or 
to your mana pool. or to your mana pool.
, : Target Elemental gets +2/+0 until end of turn.
