Swell the Host

Swell the Host is a 100-card Commander precon from Commander 2015, released November 13, 2015. It is led by Ezuri, Claw of Progress, a Simic commander.

Ezuri, Claw of Progress

Whenever a creature you control with power 2 or less enters, you get an experience counter.
At the beginning of combat on your turn, put X +1/+1 counters on another target creature you control, where X is the number of experience counters you have.

The list runs 41 lands and 33 creatures, and its nonland cards average 3.80 mana. At today's TCGplayer prices the whole deck's cards come to about $94.87, and the most valuable is Caller of the Claw at $12.90.