How the ranks were chosen
The ant board ranks the 11 published rarities for slot priority. The mutation board ranks EFF potions by multiplier. Both are editorial. They use the same ladder the shop and upgrade guides describe, and they do not assign a rarity to every named ant.
S tier
Player decision Keep a Cash reserve before you roll egg tiers that can offer Celestial. A direct Robux buy is optional, not the normal loop.
Player decision Treat OP as a permanent slot when you can buy the offer. It is a mutation target, not mount fodder.
A tier
Player decision Keep Divine if the live panel beats your other ants. Level and mutation can matter more than the label alone.
Player decision Buy it when it beats a filled slot. Do not drain the reserve on Egg Rolls and then miss the purchase.
B tier
Player decision A long-term producer while you hunt Secret and above. Mutate one only if you expect to keep it.
Player decision Use Mythic to fund later rolls. Replace it when a higher rarity is affordable and slots are full.
C tier
Player decision Worth a slot and a mid potion such as Bubblegum if you will keep it through the session.
Player decision Place Epic over Common. Do not spend Petal or Starlight here.
D tier
Player decision Fine for an empty early slot. Replace it when Epic or better is affordable.
Player decision Use it to start food flowing, then overwrite it.
Player decision Place a Common only in an empty slot. Replace it as soon as a better offer is affordable. Do not put a paid mutation on it.