You Should Play Dress Down in cEDH

Dress Down by Iain McCaig
If you've played against just about any blue cEDH deck, you know how important creatures with enter-the-battlefield triggers can be, with one key card sticking out above all else: Thassa's Oracle
Regardless of how you feel about Thassa's Oracle
So, how can we stop this, along with the bevy of other important creatures with enters-the-battlefield triggers currently running around cEDH? Let's take a look at another two-mana blue spell, Dress Down
Breaking Down Dress Down
First off, the card. For , Dress Down is an enchantment with the all-important flash keyword, two triggered abilities - one which causes its controller to sacrifice it at the beginning of the end step, and another which draws its controller a card when it enters the battlefield - as well as the static ability, "Creatures lose all abilities."
Like Borne Upon a Wind
Dress Down
A Meta Call: What Dress Down Answers
We've already run through the most prolific threat, which Dress Down
A prolific infinite mana deck, TymnaThras frequently closes out games by sinking infinite mana produced by some sort of Devoted Druid
Either target an in-graveyard Devoted Druid with Hazel's Brewmaster's ETB or enchant a still-living Devoted Druid with Swift Reconfiguration to make infinite .
Now, Swift Reconfiguration
Moving to another tournament-dominating deck, we can look to the role of Endurance in cEDH all-star Kinnan, Bonder Prodigy
Beyond stopping things that end games outright, Dress Down
Where to Play It
The Master of Keys
If Dress Down is already good (and I hope that I've convinced you as much), then The Master of Keys breaks it into an all-out game-dominating staple. Provided you're able to keep your graveyard stocked (maybe you're playing Hedron Crab...), Dress Down goes from a one-shot pseudo creature counter to a repeatable one. Cast it turn after turn thanks to its escape cost (it doesn't matter that The Master of Keys will lose its abilities, that only happens once Dress Down has resolved), gaining real card advantage in the process and locking down creatures until you see a window to win.
Thrasios x Anything
I've already called out TymnaThras once before as a deck which is particularly susceptible to a well-timed Dress Down, but its grindier gameplan (and mass-mana generation capabilities) are also exactly the suite of effects which are conducive to running it with ease, as well.
Similarly, I'd argue that the strictly faster red version of Thrasios (most commonly Thrasios paired with Rograkh, though Thrasios with Bruse Tarl, Boorish Herder also lurks around some tables) can also comfortably play this card. While it isn't proactive by any means, Dress Down's ability to hit some of the most ubiquitous and otherwise minimally interactable threats is more than worth the , especially considering how much mana red-Thrasios routinely has access to.
Blue Farm
Finally, Blue Farm. While this deck may run red, Necropotence, and Ad Nauseam, make no mistake: it can comfortably play the long game, a quality which has helped it to maintain its potency in the currently slower metagame. As such, while Dress Down may be among the 101st cards for many Blue Farm players, I implore those with a more control-oriented mindset to give this card a try. It won't win games, but it will certainly save you from losing them.
Wrap Up
Dockside Extortionist may be gone, but the proof is in the decklists: a whole lot more than just Thassa's Oracle is ending cEDH games thanks to a triggered ability. Couple that with the longer, more interactive games, and why not give Dress Down a try? At the very least, you'll get to draw a card.