Marf, the Magnificent

Phasing (This phases in or out before you untap
during each of your untap steps. While it's phased out,
it's treated as though it doesn't exist.)
If damage is dealt to Marf, the Magnificent that
would destroy him, it instead deals damage equal
to his toughness -1. This ability can only be
triggered once per turn.
{r}{r}{r}{t}: Flip a coin. If you win the coin flip,
Marf, the Magnificent deals 6 damage to
target creature.