As Magic: The Gathering teams up with just about any IP of note that fancies getting in on the TCG game, none of its crossovers have matched the hype that surrounded its Final Fantasy crossover
In the middle rounds, you can sit back and control with cards like Prismari Command or set up your big interactions with cards like Ojer Pakpatiq, Deepest Epoch
Suitable Campaigns Given that you don't really care about winning scenario 1 (and since you really want to pull off that scenario 8 madness with Deciphered Reality I just described), Ursula is another great candidate for a Carcosa Expert Solo run, as you can use the "Suicide Cheat" (that I'll explain in a second) in Carcosa's scenario 1 without feeling bad about it
Trainer Cards: Trainer cards offer a variety of effects that can help control the game
Malakir Bloodwitch [Vampire]: Even if you don't net that much from the vampire clause, it flies
Can I get my opponent to 6