With its Energy Link attack, you can chip away at your opponents Pokemon, dealing ten damage at a time while ramping Entei up with Energy from your discard pile
Here's the thing: how fast you collect the set (how many drafts you need to do, which is proportional to how many gems you need to spend, since you can't "go infinite" with ranked drafts) depends MUCH more strongly on how many "new" Rares you collect each draft as opposed to how many games you win
And you better believe the wielder of 13 will remember that story forever
You can tune the piles based on power level
Even better, you can exile it after it is played and then you are able to play it again next turn creating a second Wizard token to deal a total of 2 damage for every non-creature spell you cast
To check out the full Brothers War story, product line and events head on over to The Brothers War Site @ Wizards of the Coast