Corwin, Champion of Magicka

Reach, {t}{1}{g}Regenerate target creature.
{1}{r}When Corwin attacks, roll D20.
1-7 Deal 1 damage to creatures blocking Corwin.
8-14 Target creature gains double strike
and haste until end of turn.
15-20 Put a duplicate counter on Corwin.
If damage would be dealt to Corwin, flip a coin,
if tails, prevent that damage and remove
a duplicate counter from Corwin.