In general, when looking at power level, I considered the overall game plan, the synergy of the 99 with that game plan, things like interaction, ramp, mana base and card draw, the commander, and the power of the remaining stand-alone cards
If you're looking for deck ideas to work on while you go out and trade for cards at your Prerelease this weekend, this is a great place to start
Once youre venturing into the Dungeon a bunch, you can start to leverage Sefriss second ability
These include the AI Armor Great Wave Matte Dual Art Sleeves, which feature a timeless piece of Japanese art reimagined
All of the cards on this list, save Intuition and Underground Sea, are from a group of cards known as Power 9