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So with Flints Willpower at my disposal, I would be able to attach a Double Colorless Energy for my regular energy attachment, and then play Flints Willpower to attach a Grass Energy and there we go: a turn 2 Giga Drain

They pay their remaining mana and choose a player to gain control of during their next turn

More likely than you think

Offering to return a permanent with mana value three or less to the hand or the battlefield depending on if youre the Monarch, Court of Ardenvale could find a home in any deck that runs even Evolving Wilds

Or are you like me and kept the old intro decks together as a cycle and play them against each other