Ammon, Lord's Servant

Ammon, Lord's Servant can't be countered.
During your turn Ammon has first strike.
When blocking Ammon has indestructible.
Witness (When this card would enter your graveyard from the battlefield instead exile it. As long as this card is exiled, its abilities remain in effect as if
it were on the battlefield. Anytime a Prophet enters the battlefield, this card leaves exile and is put into your graveyard.)
All other creatures you control have first strike.