mtg dungeon cards D&D x Secret Lair Bonus Cards!, Not sure if there are others to be pulled, but these were the bonus I got from each D&D Secret Lair. Reliquary Tower won, but the art on that Delver DUNGEON OF MAD MAGE :

Personalization Built In Every box features a writable top label so you can name your deck, identify your fleet, or record the captain currently in command

So in this one case we decided to lump a handful together, headlined by the leaders of the franchises two primary factions

The others went through a few rounds of brainstorming though

Shadowmoor had an uncommon cycle and one rare card with twobrid mana

Cheat up to two creatures into play from your library, at instant speed, for only four mana

Jadelight is punchy and front loaded enough to work well in the tempo and aggressive decks yet still option dense and value generating enough to be great in the slower decks too