If you've played BO1 on Arena you've probably definitely seen this deck, but it's making some waves in BO3 as well.
It's pretty simple, mull until you get a hand with either of the discover cards, lands/ramp or filtering cards to find them. An ideal hand has one of the discard-for-a-treasure sorceries, 3 lands and an Appraiser to go off turn 3, but with several of the treasure ramp cards you can also go into a turn 4 Dinosaur. Either Consign or Bedeck serves as our interaction without getting in the way of Discover.
Once you've started the discover chain, with Appraiser you'll hit either a clone (Glasspool is preferred but you can use Mirror Image if you're light on wildcards) or Eldritch Evolution. Evolution gets us to our Carnosaur, which starts the chain again but we can hit Appraiser as well. Continue until you find the last Eldritch Evolution and grab a Doomskar Titan to give everything you control +1/+0 and Haste.
Between this and Quintorious combo I feel like there's a strong chance of something getting hit on the list. Given that it's all based around Discover, could we see an errata similar to Companion? I feel like it's unlikely, given that they could have just put "if this card was cast from your hand" and not had this issue
Yeah, these decks are great examples of bad game design. Another one is [Geist of Saint Traft] in round 1.
They perform well above curve, dealing huge amounts of damage in the first few turns of the game. Which would be a balancing concern, not necessarily bad game design.
What makes it bad game design is that they are very non-interactive. There is not much the receiving player can do but sit and watch, or concede. Unless you're lucky enough to have one of the few counters ready when it's needed.
So mostly, these decks just play on their own, as if there was no opponent present. The only consolation is, it's over fast, and reshuffling a digital deck is easy. I would hate to shuffle an actual deck for these time wasters.