The collaboration will consist of four ready-to-play, preconstructed 100-card Commander decks and three Secret Lair drops. If you're new to Magic, Commander is an exciting, unique way to play Magic that is all about awesome legendary creatures, big plays, and battling your friends in epic multiplayer games! More information on the format can be found here.

Prefer playing a different format? Individual cards from the collaboration will be legal in Commander, Legacy, and Vintage.

Here's the more detailed breakdown of everything that's part of this collaboration:

Four commander decks that also come in a Collector's Edition and a unique "Universes Beyond" frame.
Decks:
Tyranid Swarm (green-blue-red)
Forces of the Imperium (white-blue-black)
Necron Dynasties (mono-black)
The Ruinous Powers (blue-black-red)
The Collector's Edition comes fully foiled with the never-before-seen special surge foil and has the same card content. Images below!
Three Secret Lair drops, which we're excited to share more info on later.
Secret Lair x Warhammer 40,000: Orks
Secret Lair x Warhammer Age of Sigmar
Secret Lair x Blood Bowl