Crimson Splitjaw

Haste, trample, flying, ward {1}
Crimson Splitjaw doesn't untap during the
untap step.
When Crimson Splitjaw attacks, you may pay
{r/g}. If you do, destroy target artifact.
{3}: Untap Crimson Splitjaw, Activate this ability
only once per turn and only as a sorcery.