Mosey the Matted

Mosey the Matted enters the battlefield
with six Mat counters. When Mosey the Matted becomes the target of an attack, remove one Mat counter for amount of damage absorbed (ex: if
attacked by a 2/2 creature, remove 2 counters)
When all Mat counters are removed, Mosey the
Matted becomes a 7/7 creature with trample,
double strike, and vigilance