Ornithopter, of one and all

All Thopters cost {2} less.
All Thopters are indestructible.
You may have any number of cards called Ornithoper.
Whenever a Thopter enters the battlefield each Thopter gets a +1/+1 counter on it.
When a Thopter enters the battlefield search you're library for a Thopter card put it into you're hand.