Derelor and all thrulls are just my unofficial additions that it *COULD* be nice to add if Jatill likes them too but, by a practical point of view, they counts as empty slots. Also, there are slots for
Avenging Angel,
Alabaster Dragon, a cloned
Utopia Tree and a few other slots in "best of Homelands" part that are in the CSV but are not part of Jatill's project so they can be recycled with no harm at all. Anyway, in this way we have more or less 10 free slots.
If we go and kill some cards from Dark and Legends, then I think we may get around 100 more spaces for other new cards, but I would suggest to think very carefully to what we are going to delete or replace, because there are a bunch of cards from those sets that would still be nice to activate and that would add more flavor to sealed deck games. For sure, I'm NOT talking about those lands that give banding to legendary creatures without providing any mana, but if you spoil the whole Legends & Dark list, you may still find some cute uncoded card that would be worthy of to activate. Just think about
Mana Drain, that now is finally coded!
Have a nice day!