Id play 10 of it if the rules of Commander allowed it
Lets look at the best deck for each criteria: value, fun, and competitive potential
For this count, we are only counting cards that can produce Powerstone tokens

Cape Fear Games Browse Sell Us Cards CFG Events Table Top Games About Us Sell Your Trading Card Collection Sign In | Register $ Buylist Browse Advanced Search You're currently browsing our buylist Return to Store Buylist Magic Singles Mystery Booster 2 Playtest Cards Back to Mystery Booster 2 Playtest Cards NM-Mint, English, limit 4 Buy this product instead Details Color: Colorless Rarity: C Cost: 8C/PC/P Pow/Tgh: 12/12 Card Type: Legendary Creature - Phyrexian Eldrazi Artist: Will Liu Name: Kozilek, Compleated Finish: Regular Card Number: 999-KC Set Name: Mystery Booster 2 Graded: No Related Products Wisedrafter's Will Mystery Booster 2 Playtest Cards NM-Mint, English Limit 3 NM-Mint, EnglishLimit 3 NM-Mint, English Limit 3 Chea, Friend to Maybe Too Many Mystery Booster 2 Playtest Cards NM-Mint, English Limit 4 NM-Mint, EnglishLimit 4 NM-Mint, English Limit 4 Marchesa's Surprise Party Mystery Booster 2 Playtest Cards NM-Mint, English Limit 4 NM-Mint, EnglishLimit 4 NM-Mint, English Limit 4 Questing Cosplayer Mystery Booster 2 Playtest Cards NM-Mint, English Limit 3 NM-Mint, EnglishLimit 3 NM-Mint, English Limit 3 Gobland Mystery Booster 2 Playtest Cards NM-Mint, English Limit 4 NM-Mint, EnglishLimit 4 NM-Mint, English Limit 4 Champion of the Hareish Mystery Booster 2 Playtest Cards NM-Mint, English Limit 3 NM-Mint, EnglishLimit 3 NM-Mint, English Limit 3 Wowzer, the Aspirational Mystery Booster 2 Playtest Cards NM-Mint, English Limit 4 NM-Mint, EnglishLimit 4 NM-Mint, English Limit 4 Who's That Praetor

I've made it a point to build my collection to include the entirety of Magic 's history, not just recent blocks
Either way, it's a nice cheap creature that comes back over and over