Ikoria: Lair of Behemoths contains TBA cards (TBA basic lands, TBA commons, TBA uncommons, TBA rares, TBA mythic rares), and includes randomly inserted premium versions of all cards. Additional cards are found in the set's Theme Boosters and a unique Buy-a-Box promotional card is also considered to be part of the set. Cards with alternate card frames have another card number than the original version. Borderless planeswalkers are numbered #TBA-TBA, Showcase cards are numbered #TBA-TBA, the Buy-a-Box is #TBA, Theme Booster rares are #TBA-TBA and extended artwork cards are numbered #TBA-TBA. The Bundle promo is numbered #TBA. Finally there are FNM-treatment cards from the Universal promo pack numbered #TBA-TBA. Both regular and foil versions of these cards may be found in the Collector Boosters.
Ikoria: Lair of Behemoths will feature an e-book.
Ikoria: Lair of Behemoths is sold in regular 16-card Draft Boosters (one card being a marketing card), mono-colored Theme Boosters, Collector Boosters, the Ikoria: Lair of Behemoths bundle and five Commander decks.
- Tabletop Prerelease: April 17-19, 2020.
- Commander Nights: April 27–June 18. A weekly Commander league with rotating rules and achievement-based prizes.
- Box topper: TBA
Themes and mechanics
The set introduces the keyword ability mutate (possibly the mechanic mentioned above). You can mutate a creature you control, but it is currently unknown what that entails. Mutate was first referred to on the silver-bordered card Surgeon ~General~ Commander in Unsanctioned.
Planeswalker decks are discontinued for expansions. For this set, they are replaced by five Commander decks (Ikoria Commander). This is essentially Commander 2020 aligning with Ikoria: Lair of Behemoths. The 71 new cards in the decks are set on the world of Ikoria, but the reprints can be from anywhere. There are a handful of cards from the main Ikoria set in these decks in the reprint slots, but the number is fairly small. The cards are only legal in Eternal formats like Legacy, Vintage, and Pauper. They have their own expansion symbol and set code (C20) to set them apart.