Kurthnaga, Goldoan Prince

Kurthnaga, Goldoan Prince cannot be countered
{1}{b/r}: put a Laguz couter on Kurthnaga
At the beggining of your end step, remove a laguz counter from Kurthnaga unless there are 4 or less
Laguz counters on kurthnaga.
As long as this creature has 5 or more Laguz counters, it gains +5 /+5, flying, and {t}: destroy
target nonland permanent