Skerrit, The Hoofed Lord

Vigilance, trample
Whenever Skerrit, The Hoofed Lord deals
combat damage, place a mimic counter on it.
At three counters, gain +5/+5.Whenever it
attacks, untap all creatures you control. If this
was the first combat phase, there is an additional
phase after this one.
"In the heart of the Fey realm, his hooves shake
the earth below. Leading with wisdom and might,
the All-Father awakens."