In short, Gardevoir can wish up a field full of energy in one turn, dramatically accelerating your setup (and yes, this echoes the beloved old Gardevoir strategies of powering up your board!)
An alternative deck strategy is to include Lilligant instead of Exeggutor for energy acceleration
The first Legendary goblin on my list, Krenko, Mob Boss does exactly what we want to do when playing goblins
Typical elf and artifact ramp decks are more like sprinters while this is a more like a marathon runner ramp deck
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Given that its likely to bring new players to the fold its surprising more hasnt been done to smooth their entry, with the rules guide in the starter kit being the absolute bare minimum of explanation and a QR card to lean more