Diana Stanley graduates from uni of cancelation

Disclaimer: It's a general catch all deck that is fully aimed to support and protect pure aggro investigators. There're some optimisations you can make based on the investigators you support (namely with the inclusion of either Strong-Armed or Eldritch Tongue) but otherwise, it's pretty solid. It won in hard the TDC campaign in hard blind and got the true? ending by gathering all the glyphs and doing a certain choice during a scenario to enable the final showdown.

Recommandation: initial trauma for this deck should be two physical and one mental. You may include a single Second Wind for damage heavy campaign, but you won't need it. Diana is much more concerned about her sanity to fuel her Ward of Protection.

Diana got tons of cool tools with the release of the drowned city.

At level 0, the MVP of the deck is Spectral Shield. Remember when we used to play Delay the Inevitable to abuse it with her blade? Well, no more of that inefficient crap. We finally got something truly tuned to make Diana shine, and it synergies perfectly with her card pool. With the new spell asset Eyes of the Dreamer, you can give perfect coverage against the mythos for your fellow investigators. Every time your friends get a tiny bit of sanity or damage, you can just remove a charge from Eyes of the Dreamer. And if you don't have it in play? It's fine since you can still place it beneath your investigator card and play it later with your Twilight Blade. Eyes of the Dreamer can be used to investigate if your team is behind in tempo, but you'll often have to sacrifice three charges for a chance to succeed.

The list also includes a small bless package to be open on the Sacred Covenant cheese where you get her ability trigger for free (very good during investigation phase). If your team runs a lot of cursed value card like Faustian Bargain or Deep Knowledge, or even some Dread Curse as weaknesses, you may consider an extra copy of Tides of Fate in the list. Otherwise, the tide is there to combo with Tempt Fate and Rite of Sanctification for extra blesses with minimum cost (fast and convert up to two curses into blesses).

Foresight is the best cancellation card in the game, and can be enabled with scroll of secret... or the much needed Eye of Ghatanothoa. It's one of your pririotiy upgrade to replace your Holy Rosary. That setup is good for any mystic, but Diana get two extra uses of Foresight through her Twilight Blade and you can cancel up to two mythos cards with a single Foresight with both in play.

Down the Rabbit Hole has tons of good upgrades. Vicious Blow, Enraptured (for extra scroll of secret charges), Safeguard, and all the good spell target (further supported by the single copy of Arcane Research for a smoother leveling).

Ideal upgrades should include x2 Seal of the Elder Sign and the new Sacred Oath with its equivalent. Oath are really good since if you assemble two of them, you have coverage on the type, and you can choose to discard the subtype of encounters that is the less present in the encounter deck. You can even retrieve them with a Seal of the Elder Sign.

You may include any time a copy of Observed, since extra xp, trauma removal, or general setup and taroot card that help the team are good to take.

The new mythic permanent Eldritch Brand won't be necessary for this deck since there won't be any other spell asset than Eyes of the Dreamer.

Safeguard should be used to follow your dedicated fighter to form a killing squad where you can commit your Vicious Blow and use your Hunter's Mark on bosses or though elites. Spectral Razor are there as a panic button if you're main fighter is overwhelmed or need assistance to deal with a pesky aloof enemy. Don't assume you'll succeeed since you'll be at most testing at 7. The list don't include the OP masks from Hemlock Vales since I pretty much ban their vanilla version on the game I play but you may include a Wolf Mask if you want to fight effectively, or having more chance to pass agi tests.