Eternal Card Game

Uldra, Veilripper is a Legendary card from the Trials of Godov expansion. These cards cannot be created via shiftstone and are only available if you buy the campaign for 25,000 gold or 1,000 gems ($10 cost).

I built a deck with 4 copies of Uldra, a bunch of shift units, and 4 copies of Dark Return. I played against the first gauntlet opponent and stalled the game until I got Uldra in hand. Once I had three shift units in the void, I played Uldra to bring them back, then got three more shift units in my void and overplayed units so I could sacrifice Uldra to bring back three shifted units again. Then I used Dark Return to get Uldra back and once I had three shift units in the void, I played Uldra again.

The achievement popped at the end of the match,