Scribe
Legend
Now, I'm not saying that DMs shouldn't reserve the right to reject player requests, but when many players aren't very invested in the lore of these worlds, saying "no" because of lore will always frustrate them. In their heads, they bought a book, the book gives these rules, why can't I use them? For them the DM saying no "because in this world those don't exist" seems like a spoilsport move.
This is becoming more common as many new D&D players have much less experience with these worlds and lore.
This is already possible though. They dont need to mess with the lore of these distinct and separate games. They already have the Magic Setting books, and thats enough.
Sitting down and seeing Drizzt cast at 3 mana (1WR?) is going to just be annoying, but hopefully I can lightning bolt him and move on.
I get what you are saying, but to me the lore isnt about lineage restrictions, its about making the settings 'alive' and distinct, without making them smaller.
Teferi solving the Blood War, means the Player Characters are not solving the Blood War.
Liliana making a deal with Orcus, just replaces the players from being the 'stars' of the campaign.
Not even going into then the issues of how Magic works, Gods, Planeswalkers...and what will LIKELY ruin my one great desire left, Sigil and Planescape.