Aganos, Pursuing Guardian

Aganos enters the battlefield with two shield
counter on it.
{g}, Discard a land card: put a shield counter on
Aganos. (Aganos can't have more than four shield
counter on it.)
{g}{g}, Remove a shield counter: choose one —
• Target creature can't block this turn.
• Aganos gains trample until end of turn.
• Destroy target nonland noncreature permanent.