Charring Trepidus

Charring Trepidus enters the battlefield tapped.
{t}: Add {r} to your mana pool.
{r},{t}: Charring Trepidus deals 1 damage to target creature or player. If target creature is blue or green or target player controls a green or blue permanent, it deals 2 instead.
At the beginning of your end step, untap Charring Trepidus.