Gwyn, Lord of Light

Gwyn, Lord of Light enters the battlefield
with five flame counters. At the end of your
turn, if Gwyn, Lord of Light has no flame
counters on it, transform it.
When Gwyn, Lord of Light attacks, remove a
flame counter from it, then attacking creatures
you control gain first strike and "Whenever this creature becomes blocked, it deals damage equal
to its power to any target."