Archmage Emeritus triggers a draw for every instant or sorcery you cast or copy, which is essential for sustaining the high-mana requirements of the Opus mechanic
When you crack open a fresh booster pack, youre guaranteed to pull six Common and three Uncommon cards, for starters
This reduces the creativity players can make in their deck building, which makes the format feel a bit stale
Darkness is the Fog equivalent for black, and Holy Day is the Fog analog for white
I am not trying to discourage you from playing the deck, I think it is a solid choice, but be aware that a normal Lost Box deck (like the one we covered above with Zamazenta) can be less risky
This combo, which is easy to assemble with Scavenger's Talent, used to be fruitless in the face of Vein Ripper, as your opponent would drain you twice as fast