Da'Mars, Serpent's Friend

Naga, Snakes & Serpents you control have
nonbasic landwalk & gets +1/+1 for each of
their colors.
{b/g}{g/u}{u/b},{t}: Destroy target permanent. Then if
that permeant had counters on it create a 0/0
black, green, blue legendary snake creature token
named "Tar'Vef" with that many +1/+1 counters
on it. Activate this ability only if a creature you control dealt damage to a player this turn.