For the cost of one Grass Energy, you can search your deck for up to 3 Basic Energy cards (of any type), and attach them to your Pokmon in any way you want
Among the full-art foil cards are N and Shaymin-EX, both popular cards at tournaments
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That means getting an extra two mana, putting you at six, and starting with one spell already cast to trigger prowess
Turns out Red cards that generate mana tend to be extremely popular, while the back side, Harnfel, Horn of Bounty, is basically like a tame Yawgmoth's Bargain where you can just keep drawing cards so long as you have the resources for it