A whole bunch of new variants are about to be available in the coming month. Second Dinner announced news about what variants will be dropping in the Guardian's Greatest Hits Season.
Quote from their discord:
"Gnarly gameplay, wicked vibes, and schweet style come together with the release of 25+ new variants during Guardians Greatest Hits from awesome artists like Skottie Young, Peach Momoko, and Eduardo Francisco. These variants will be released through-out the season! "
Ultimates
When Destroyed: Give your cards +1 Power.
Game Start: Shuffle the six Infinity Stones into your deck.
Super Rare
Each turn your opponent doesn't play a card here, +2 Power. (except the turn you play this)
On Reveal: Copy the text of your deck's top card.
On Reveal: If your opponent played a card here this turn, +4 Power.
On Reveal: Shuffle Mjolnir into your deck.
Ongoing: Split your total Power evenly among all locations.
On Reveal: The top card of your opponent's deck costs 6 until turn 6.
On Reveal: The top card of your opponent's deck costs 6 until turn 6.
On Reveal: Banish the card that costs the least in your
opponent's deck.
Rare
Ongoing: Tap this to see the top card of your deck.
Game Start: Unlock the potential of your cards with no abilities.
On Reveal: If your opponent played any cards here this turn, copy one of them into your hand.
Ongoing: Has the Ongoing effects of all enemy cards.