Ranked on what the published sources document: the mutation multipliers, the species the 16 rebirth tiers require, and the gear unlock order. Per-pet stat sheets have yet to be published, so nothing here invents scores.
Checked 2026-10-06Documented systems only
What can honestly be ranked
A tier list needs comparable stats, and the published sources give exactly three comparable systems: mutation multipliers (Golden 1.5x, Cosmic 2x, Inferno 3x, Admin 4x), the rebirth requirement ladder (which species the game itself asks you to keep), and gear unlock tiers. Pet-by-pet income stat sheets have yet to be published by the developer, so this page ranks roles and systems, not invented per-pet scores.
The ranked table below follows the game's own revealed preferences: the species the 16 rebirth tiers require are, by definition, the collection targets the developer balanced the game around.
Tier S: the mutation multipliers
Admin (4x income and sale value) tops the system: it only appears during developer-run Admin Abuse windows after updates, which makes it the rarest documented multiplier. An Admin pet is the strongest single asset in the game.
Inferno (3x, Volcano event) and Cosmic (2x, Cosmic Invasion abduction) are the scheduled premium tiers - both arrive through event windows, so event attendance is the ranking mechanic. Golden (1.5x) is the roll-exclusive baseline: the most accessible mutation, and the one Pro Game Guides counts inside the 29-pet rebirth total.
One mutation per pet, no transfers: a mutated pet's slot decision (keep vs. sell) is worth more than any species-vs-species comparison.
S tier
The mutation multipliers
The strongest documented assets in the game, ranked by multiplier.
Mutation tiers, best to baseline
Mutation
Multiplier
How obtained
Notes
Golden
1.5x income and sale value
Pet Rolls only
No event requirement; roll luck decides when a Golden appears.
Cosmic
2x income and sale value
Cosmic Invasion event
A spaceship abducts pets from your base and returns them mutated.
Inferno
3x income and sale value
Volcano event
The event spawns a volcano, and pets in your base have a small chance to return mutated.
Admin
4x income and sale value
Admin Abuse events only
Developer-run windows announced after updates; the community Discord tracks them.
The ladder's requirement pairs are the closest thing to an official tier list, because the game gates progression on holding them: Cat + Chicken (tier 1) through Owl + Llama (tier 3), Sphinx + Pegasus (tier 9), Roc + Hydra (tier 10), Qilin + Simurgh (tier 11), Dragon + Unicorn (tier 12), and the mythic end (Fairy + Mermaid at tier 15).
Pro Game Guides counts 29 different pets across the full ladder including Fish-type and Golden-mutation pets, while the table itself names 30 entries - the gap is Golden variants (Golden Kitsune, Gold Unicorn, Gold Dragon).
Practical ranking rule: any species named in your next two upcoming tiers is tier A for you personally, because it gates both a permanent Luck jump and the gear unlock attached to the tier.
A tier
The rebirth requirement species
The game's own revealed ranking: species the 16 tiers gate progression on.
Requirement pairs across the 16 rebirth tiers
Tier
Cash cost
Required pets
Rebirth 1
50,000
Cat + Chicken
Rebirth 2
150,000
Bunny + Bat
Rebirth 3
750,000
Owl + Llama
Rebirth 4
1,500,000
Zebra + Elephant
Rebirth 5
2,500,000
Lion + Stegosaurus
Rebirth 6
5,000,000
YiQi + Mammoth
Rebirth 7
7,500,000
Velociraptor + Azhdarchid
Rebirth 8
10,000,000
Gargoyle Bat + Cockatrice
Rebirth 9
25,000,000
Sphinx + Pegasus
Rebirth 10
100,000,000
Roc + Hydra
Rebirth 11
250,000,000
Qilin + Simurgh
Rebirth 12
1,000,000,000
Dragon + Unicorn
Rebirth 13
10,000,000,000
Golden Kitsune + Gold Unicorn
Rebirth 14
100,000,000,000
Gold Dragon + Gnome
Rebirth 15
10,000,000,000,000 (10 trillion)
Fairy + Mermaid
Rebirth 16
10,000,000,000,000,000 (10 quadrillion)
final-ladder pets from the preceding tiers
Source: Sportskeeda rebirth table + Pro Game Guides pet-count summary. Checked 2026-10-06.
these 30 names come straight from the published rebirth requirements table, so they are the safest species set to plan around: Cat, Chicken, Bunny, Bat, Owl, Llama, Zebra, Elephant, Lion, Stegosaurus, YiQi, Mammoth, Velociraptor, Azhdarchid, Gargoyle Bat, Cockatrice, Sphinx, Pegasus, Roc, Hydra, Qilin, Simurgh, Dragon, Unicorn, Golden Kitsune, Gold Unicorn, Gold Dragon, Gnome, Fairy, Mermaid.
Golden Kitsune, Gold Unicorn, and Gold Dragon are Golden-mutation variants of base species, which is why Pro Game Guides counts 29 unique pets while the table lists 30 names.
Source: Sportskeeda rebirth table + Pro Game Guides pet-count summary. Checked 2026-10-06.
Tier B and C: income fillers and everything else
Tier B is the income roster: any pet filling a slot behind your defenses earns per second, and the official description confirms the earning continues offline. Since per-pet income numbers are in-game-displayed rather than published, B-rank is role-based - more slots filled (each rebirth adds +2) beats species snobbery at this level.
Tier C is everything with no documented multiplier or requirement hook: species outside the ladder, unmutated duplicates beyond Index needs. These are sellers, and selling them funds tier S and A moves.
The gear equivalent: the bat line scales Steel through Demon, so a 'gear tier list' is just the rebirth table read left to right - which is why the gear ladder page exists rather than a fake meta ranking.
Role guide
Decision roles while you climb
The labels below are decision roles for your current roster, not claims about specific pets.
A
Income pet
Earn
Early tip
Use the pet whose displayed income best supports your next affordable build step.
Role guidance only; no official pet table was published.
A
Protected pet
Defend
Early tip
A valuable pet only helps if your base layout makes it difficult to steal.
Defense values remain unknown.
B
Open slot
Raid
Early tip
Keeping space available prevents a successful steal attempt from being wasted.
Checklist guidance, not a pet ranking.
FAQ
Tier list questions
What is the best pet in Build a Base and Steal?
By documented multipliers, a pet carrying the Admin mutation (4x income and sale value) is the strongest single asset; among systems, the species your next two rebirth tiers require are the best holds.
Why no named S-to-F pet rankings?
Per-pet stat sheets have yet to be published by the developer; ranking named pets against each other would invent numbers. The documented systems - mutations, rebirth requirements, gear tiers - rank cleanly instead.
What are the mutation tiers?
Admin 4x, Inferno 3x, Cosmic 2x, Golden 1.5x - all multiplying income and sale value, per the Sportskeeda table published August 5, 2026.
Which pets should I never sell?
Your next rebirth requirement pair (held until claim), any mutated pet, and one of each species for the pet Index - everything else is sale-eligible.
Do rarer pets always earn more?
The ladder moves from farm animals to mythicals, which tracks with income, but the published multiplier system (mutations) matters more: a mutated common out-earns an unmutated mythic at the same multiplier gap.
