Toxicroak

You may sacrifice a creature named Croagunk
rather than pay this spells mana cost.
Flash
Infect, haste
Toxicroak can't have -1/-1 counters placed on it.
If the defending player this turn controls a
Mountain or Desert, Toxicroak gets -1/-1. If that
player controls an Island, Toxicroak gets +2/+2.
{p/b}, {t}: Toxicroak deals damage equal to half
its power rounded down, to target tapped
creature.