For serious money, buy already graded
Here are the ones I'm most excited for: Ugin, the Spirit Dragon Containment Priest Grim Tutor (first ever reprint
You want to construct a gamestate where you can safely assume that your removal spell will resolve, while also having an additional card at the ready to deal with whats going to follow up
I have two samples, one compiled by myself from various Youtube videos, and one from a single 1000 pack (or more likely, 1008 pack) opening by Youtuber Derium
Once players know the format better these numbers will likely shift a bit, but if you want to see where things lie going into March of the Machine, we've picked out the biggest bombs in the format, and taken a look at the top commons in each colour
Swellow has the following attacks: Wing Attack - 50 damage