When Verdant Carnarium enters the battlefield, sacrifice it unless you pay .
: Add or to your mana pool.
: Add to your mana pool. Put Verdant Carnarium on top of your library.
: Regenerate target Rat.
.
: Add or 
to your mana pool.: Add 
to your mana pool. Put Verdant Carnarium on top of your library.
: Regenerate target Rat.
