They're the most expensive cards in the exchange, costing 2500 Pack Points each
Instead of letting your opponents creatures go to the graveyard, you can trade life points for their control and eventually send them into exile
In Standard that looks like just Mono-Green Aggro
Decklist: WU Aura / Rooms Ethereal Armor deck in Standard Creature (20) Optimistic Scavenger x4 Inquisitive Glimmer x4 Fear of Impostors x2 Entity Tracker x3 Enduring Curiosity x2 Monastery Mentor x4 Overlord of the Floodpits Enchantment (17) Dollmaker's Shop // Porcelain Gallery x3 Grand Entryway // Elegant Rotunda x2 Bottomless Pool // Locker Room x3 Surgical Suite // Hospital Room x2 Combat Research x3 Ethereal Armor x4 Land (23) Adarkar Wastes x4 Floodfarm Verge x4 Seachrome Coast x4 Valgavoth's Lair x3 Island x4 Plains x4 Heres a Standard aggressive deck that uses eerie cards like Inquisitive Glimmer and Entity Tracker, coupled with some rooms that generate tempo and card advantage
This shaman is simply one of the most flexible creatures in the game, combining ramp, graveyard hate, and long-game utility all attached to a simple, easy-to-cast 1-drop
Meanwhile, Wizards of the Coast appears to be chasing the same results with its Secret Lair drops that sell out in minutes and leave so many people disappointed, with the company adding more spin-off sets this and next year than in multiple previous years combined