Vaunted Dragonrider

Renown 3 (When this creature deals combat damage to a player, if it isn't renowned, put 3 +1/+1 counters on it and it becomes renowned.)
As long as Vaunted Dragonrider is renowned, it has flying and "{r}: Vaunted Dragonrider gets +1/+0 until end of turn".
Only those who have proven themselves to be true paragons of honour and martial skill are granted the privilege to ride a dragon into war.