Emergent Woodwurm 37/444 (Commander: March of the Machine)

Backup 3 (When this creature enters, put three +1/+1 counters on target creature. If that's another creature, it gains the following ability until end of turn.) Whenever this creature attacks, look at the top X cards of your library, where X is its power. You may put a permanent card with mana value X or less from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

NM - $6.00
LP - $5.00
MP - $3.50
HP - $2.50
DMG - $1.50