Dragonkin Knight

Whenever Dragonkin Knight enters the battlefield, attacks, or leaves the battlefield, choose one -
* Put a 2/2 red Dragon creature token with flying onto the battlefield. Then, if you control
10 or more dragons, put three +1/+1 counter on each dragon you control.
* Dragonkin Knights gets +3/+0 and gains first strike and flying until end of turn.
* Creatures you control gets +1/+0 and gain haste and trample until end of turn.