Mysterious Announcement

Firstly, the name of the Secret Lair is structured like a crossover.

This is evidenced by the redacted words having character counts of 1, 8 and 9.

Daredevil (9) is a potential answer, given that Daredevil: Born Again is currently airing.

Edge of Eternities art alongside Emrakul.

The probable answer is, unfortunately, a lot of people.

Thankfully, we won’t have to wait long to find out as April Fools is imminent.

Starter Commander Deck - First Flight And Token Triumph, Aetherdritf Commander Deck - Living Energy And Universes Beyond: Fallout Commander Deck - Science! From Magic: The Gathering.

MTG Counterspell Cards Three in a line.

Secret Lair Marvel Captain America

Left-Hand Secret Lair Magic 2 - via WOTC

via Wizards of the Coast

Magic The Gathering Cover

Tabletop

Magic: The Gathering