Saxton Hale, Austalian

Saxton Hale, Australian cannot be countered.
Saxton Hale, Australian must be blocked if able.
Saxton Hale, Australian enters the battlefield
with {x} +1/+1 counters on it.
Boast — {1}{r/g}: Untap Saxton Hale, Australian.
Put a +1/+1 counter on it. (Activate only if this creature attacked this turn and only once each turn.)