Shen-Shi, Sky Supervisor

Reach, Protection from flying creatures.
Shen-Shi, Sky Supervisor etbs with a +1/+1
counter on it for each time you've cast your
commander from the command zone this game.
When a flying creature dies, it's controller
gets a poison counter, and you make a
1/1 Pilot creature token (with its usual ability).
{u}, Sacrifice 2 Pilot tokens: Proliferate.