(: Add or to your mana pool.)
Grass-Tubes enters the battlefield tapped.
, : Regenerate target colorless permanent.
, , Sacrifice Grass-Tubes: Put a -1/-1 counter on target creature.
: Add 
or 
to your mana pool.)
, : Regenerate target colorless permanent., , Sacrifice Grass-Tubes: Put a -1/-1 counter on target creature.
