1 Aetherworks Marvel Energy's Biggest Selling Point If you're building an energy deck, Aetherworks Marvel is likely the first card you slot in
Being an instant, it also lets you set up key cards right before beginning your turn, including ramp like Sol Ring, shenanigans with Vedalken Orrery, or the ability to attack or tap with an artifact creature on your turn that would normally have to wait through a full turn cycle of summoning sickness
You can grab the Gardevoir ex League Battle Deck to get started, but be warned: some cards in that box have rotated out, so you might want to customize your build a bit
It's estimated that only 36 such cards exist in the world today which is equal to the number of participants that took part in that year's world championships
In very specific situations, these cards may still prove useful in deck construction