UB Tap-out Control (Standard)

I wanted a deck I could play on Arena while doing something else at the same time. This deck plays pretty much only at Sorcery-speed, so you don't have to pay as much attention to what your opponent is doing. On your turn, you can just play the most appropriate card, which should use up most of your mana and then you can move on.

The deck aggressively attacks the opponent's hand and tries to grind them out with several 2-for-1s. You can get rid of a lot of their threats with Plaguecrafter and Ravenous Chupacabra, and Nightveil Spectre can block pesky Hexproof creatures, while also being a threat on its own. Doom Whisperer is a must-answer threat that also provides good filtering.

The main deck is mostly geared towards creature match-ups, as that's what I'm encountering most on Arena, but the sideboard has several options against control. Arguel's Blood Fast can sneak in before the counters start coming. Sinister Sabotage provides your own counters, and Nezahal just forces itself through while also being risky to remove for your opponent. Unmoored Ego can be an answer to Teferi, but is also a way to deal with enchantments, which can be a weakness for Blue-Black.

The main deck suffers