Indeed, stepping through the flame, two elder shamans wielding staves heavy with dragon fangs and talons of thrinaxes strode forth
That five-card cycle came out in Commander 2017 , a set of Commander decks built around creature subtypes
Wizards of the Coast confirmed that Tomb of Annihilation, Dungeon of the Mad Mage and Lost Mine of Phandelver would be the only dungeon cards introduced in Adventures in the Forgotten Realms, with no current plans to add further dungeons based on D&D adventures to the card game
Once one of those happens, the other no longer has an effect
Whenever you resolve the final chapter ability of a saga while Bombadil is in play, you get to exile cards from the top of your library until you hit another saga, put it into play, and then tuck the exiled cards in a random order