Ursula will get her very own scenario deck featuring a total of 50 cards, 10 less than the usual 60 in a Lorcana deck, which will be entirely unique to the Illumineers Quest format
Yes, you can use this on Urzas Saga with the third lore counter ability still on the stack, activate it to generate a colorless mana, put it on the bottom of your library and then tutor for a 0 or 1 drop artifact, shuffling your Urzas Saga back to a random location in your deck to reuse it later
Orbeetle V is all brain - and it has ways of outsmarting anyone
You can also reuse the sacrificed copies when you play more of them, giving you repeated Demon tutors for as long as you have more Shadowborn Apostles to play
Its an okay benefit, but Id like more out of my commander especially if Im limiting myself to making a mono-white deck for it
Combined with Yellow events that also remove Life cards as costs or effects, you generate consistent card advantage that opponents cannot easily shut off