When Lava Watchtower enters the battlefield, sacrifice it unless you pay 3 life.
: Add or to your mana pool.
Sacrifice Lava Watchtower: Add or to your mana pool.
: Return Lava Watchtower to its owner's hand.
: Add 
or 
to your mana pool. or to your mana pool.: Return Lava Watchtower to its owner's hand.
