Its GX attack, which can only be used once per game, prevents the opponent from playing any cards from their hand at all in their next turn
At the start of the year, I wouldve said that Classic Jund was more or less dead, but that Urzas Saga Jund (sometimes called Jund Sagavan) was a strong deck
Delirium is a cool mechanic from back in Shadows over Innistrad that was designed as a modern version of threshold
Drover of the Mighty and Atzocan Seer can also be tossed in favor of cards that offer more options
And, much like the Lapras event, its bogged down by yet another bullshit in-game currency limiting how much you can play it, in the form of Event Stamina (Solo) hourglasses
Its exceedingly hard to pull (typically only one per case or so, making it incredibly scarce)