When Cave Tubes enters the battlefield, return a land you control to its owner's hand.
: Add or to your mana pool.
Sacrifice Cave Tubes: Add or to your mana pool.
, , Sacrifice Cave Tubes: Destroy target planeswalker.
: Add 
or 
to your mana pool. or to your mana pool.
, , Sacrifice Cave Tubes: Destroy target planeswalker.
