Emberheart Challenger Emberheart made Gruul Prowess more consistent as its prowess trigger exiles a card from the top of your library and allows you to play it the same turn
Nevertheless, it still has its place, especially when you can set up a massive Skewer or Finisher to eliminate nearly any enemy, except for the Heart
I love the little synergies and subthemes that make Seal of Doom better in one deck and Eyeblight's Ending better in another
Curse of Silence A reasonable inclusion in Hallowed Haunting-style enchantments decks or old school enchantress decks for its low cost, Curse of Silences ability to add an extra tax to a commander is nice
About Versatile This card potentially adds some insane combo potential, though the increased deck size makes your deck less consistent so it's also less likely to draw the card(s) you've chosen
Other engines include Typhlosion Prime, whose strategy with Reshiram speaks for itself, and the new Gardevoir, who can make any P Energy turn into a purple Double Colorless Energy