The LM set in the Digimon Card Game stands for Limited Packs or Limited Card Packs.
These are special, smaller releases that Bandai uses to introduce new cards, promotional exclusives, or unique reprints.

They often contain new playable cards
(such as ACE cards, Scramble options, or Training Memory Boosts)
combined with alternate artwork (alt-arts) of existing cards.

The first cards from this set were released in the Booster set BT-15 Exceed Apocalypse

Full card list below!

Card List

The card total counts - 

More cards coming soon!!