Ikoria: Lair of Behemoths is the 84th Magic expansion. It will be released on April 24, 2020.
Ikoria: Lair of Behemoths is noted to be about "building your own monsters" and will feature a new mechanic to represent this. The set is mostly designed bottom-up, but there are also some top-down individual card designs.
The setting is Ikoria, a plane of beasts and monsters. The planeswalker Vivien Reid is featured on the key art.
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.
The sixteenth card in the boosters is a token or emblem, with advertisements on the back side. There is also a set of double-sided keyword counters.
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.
Magic: The Gathering sets