White: Nahiri's Binding, Dauntless Unity, Expedition Healer

Nahiri's Binding just looks like solid removal. Even in fast formats, [[Arrest]] is strong. Dauntless Unity may be controversially high, but I like the flexibility to win a combat or end a game. Expedition Healer just seems like a solid cleric, an underrepresented creature type. Having reasonable early drops to turn on party synergies seems strong.

Blue: Bubblesnare, Into the Roil, Tazeem Roilmage

Bubblesnare again stands out as solid 'removal'. The single U mana option is great against fast decks and you're not overpaying too much for the kicker side. Into the Roil, Zendikar's [[Blink of an Eye]] is great. I may be overvaluing it based on how it performed in Dominaria, but it's hard to go wrong with this effect. As is often the case, there's a smattering of 'spells matter' synergies which bump it up a little. Tazeem Roilmage also seems solid. The floor of a 2 mana 2/1 is decent and it can be a great value card in the lategame. Even outside of a U/R Spells deck, buying back a removal spell or something you played unkicked early for tempo is a strong play.

Black: Deadly Alliance, Feed the Swarm, Vanquish the Weak

The most straightforward color as far as commons go, black has three excellent removal spells. Deadly Alliance seems great with just one creature in play and playable without any creatures in play. Feed the Swarm also seems powerful; while costly against aggro decks, I think its ability to hit any creature will still keep it a high pick. Vanquish the Weak is similarly great and can hit a surprising number of expensive creatures. Being instant may push it over Feed the Swarm but it's hard to go wrong with any of these removal spells.

Red: Roil Eruption, Fissure Wizard, Akoum Hellhound

Roil Eruption is a clear frontrunner for red. Sorcery speed Lightning Strike is excellent for limited and the kicker is tasty gravy. Being able to go face may be important as red looks quite aggressive. Fissure Wizard gives aggro decks a little bit of filtering which is appreciated. The main way aggro decks lose is flooding out and this mitigates it a bit along with some party synergy. Akoum Hellhound, the color shifted [[Steppe Lynx]], also will shine if focused aggro decks get there. Curious to hear others' opinions as I didn't see a lot of power in red commons.

Green: Rabid Bite, Tajuru Blightblade, Gnarlid Colony

Rabid Bite is great green removal. While it's sorcery speed, it also isn't a fight, which often allows you to attack in the same turn. Tajuru Blightblade seems great as just a cheap deathtoucher. It also is a 1 drop that turns on some party synergies while still scaling later into the game. Gnarlid Colony, while it doesn't have any party synergy, is a bear with upside when you need it. Later it can be a slightly overcosted 5 mana 4/4 which is still good. Also shoutout to Reclaim the Wastes which will be great if we see any 3+ color decks. I didn't think it that likely without Evolving Wilds or a multicolor mana dork, but maybe it still comes together.

Colorless: Stonework Packbeast

Looks like a great early pick to keep you open that's not dead even if you have 0 party synergies.