Overview
| Field | Value |
|---|---|
| Name (EN) | Astronomer |
| Name (JP) | 天文学者 |
| Rarity | Uncommon |
| Cost | $8 |
| Effect | All Planet cards and Celestial Packs in the shop are free |
| Unlock | Available from the start (no unlock required) |
| Trigger Type | Passive (shop pricing) |
| Overall Tier | S |
Rating & Analysis
Astronomer is the economic backbone of any Planet-axis build. Shop Planet cards (normally $3) and Celestial Packs ($4–$10) all become free — every Ante a shop refresh with 2–3 Planets or one Celestial Pack effectively returns $10–$15 in value. Use the Planets to level your hands, or Negative-copy them with Perkeo for permanent stock.
The dream trio is Astronomer + Constellation + Perkeo: Astronomer provides unlimited free Planets → Constellation scales +0.1x Mult per Planet used → Perkeo Negative-copies the Planets for permanent reuse. Black Hole Spectral (level up every hand) Negative-copied by Perkeo turns into a permanent run-wide hand-level boost.
Pairs perfectly with Nebula Deck (Telescope start) — combine with Telescope → Observatory upgrade for a complete Planet pipeline. The $8 cost is fair; in any Planet-axis run, this is a top-priority pickup. Tier lists rank Astronomer at S as the keystone Planet-axis Joker.
Good Joker Synergies
| Joker | Why |
|---|---|
| Constellation | +0.1x Mult per Planet used — perfect with Astronomer's free supply. |
| Perkeo | Negative-copies Planets for permanent scaling. |
| Fortune Teller | Tarot-axis runs alongside the Planet plan. |
| Blueprint / Brainstorm | Copy Constellation for double scaling. |
| Satellite | +$1 per Planet pack purchase — economy + Planet production. |
| Obelisk / Supernova | Hand-leveling-aligned scalers in parallel. |
Recommended Builds
| Build | Core Loop | Target Consumables |
|---|---|---|
| Trio (Astronomer + Constellation + Perkeo) | Free Planet → Constellation scaling → Perkeo permanence | Black Hole / Soul / any Planet |
| Nebula setup | Telescope + Astronomer = complete Planet pipeline | Main hand Planets |
| Zodiac setup | Planet Merchant + Astronomer mass-produce Planets | Planet Packs |
| Single-hand focus | Concentrate Planet leveling on one hand | Main hand Planet |
Tips & Usage
- Planet Merchant → Planet Tycoon and Telescope → Observatory upgrade the voucher axis.
- Always buy Planet Packs from the shop — they're free.
- Decide whether to use Celestial Pack contents now or save for Perkeo Negative-copying.
- Planets give "+1 hand level on use" instantly — Perkeo turns this into permanent supply.
- Antimatter Spectral expanding Joker slots adds Negative Planets for further scaling.
Caveats
- Builds that ignore Planet cards waste Astronomer.
- A full consumable slot can't store extra Planets (use immediately if needed).
- Perishable Astronomer is risky — finish voucher upgrades before expiry.
- Eternal Astronomer in a Planet-axis run is fine — it's a permanent free shop.
- The discount applies only in shops. Boss-kill rewards are unaffected.