Graven Tubes enters the battlefield tapped unless you pay .
: Add to your mana pool.
: Add or to your mana pool. Each opponent gains 1 life.
: Return Graven Tubes to its owner's hand.
.
: Add 
to your mana pool.: Add or 
to your mana pool. Each opponent gains 1 life.: Return Graven Tubes to its owner's hand.
