Cast a Magnet Mutations and Weather Events

Mutations and weather events are how Cast a Magnet turns a normal magnet-fishing loop into a collection hunt. Sweg Magnets’ Roblox incremental still asks you to cast, clear the reel minigame, sell heavy finds for Cash, and upgrade Real Power, Rope Length, and Luck — but mutated variants and event skies change which pulls deserve a display base stand instead of the sell button. This guide lists the community-tracked mutation vials, explains when to pop them during weather, and ties index / display synergy to keep-versus-sell calls.

Read luck and potions for permanent Luck versus 2x/4x timers, then return here when the sky looks interesting.

Mutation vial list

Community tooling for Cast a Magnet names these mutation-style consumables:

• Sandy Mutation Potion
• Charged Mutation Potion
• Phased Mutation Potion
• Gold Mutation Potion
• Rainbow Mutation Potion
• Diamond Mutation Potion

Exact visuals, odds, and durations can shift after an 🚨UPD. Always trust the in-game tooltip over any wiki memory. The design intent is stable: each vial biases casts toward a tagged variant that is rarer, flashier, and often more valuable for index completion and display flex than a plain copy of the same base item.

Mutation vials are not Cash printers by default. They are collection tools. If you need upgrade money this hour, buy Real Power or Rope Length instead — or sell commons without drinking anything.

Weather events and why they matter

Weather (and related event banners) can shift rarity tables, mutation chances, or both. Community autofarm feature lists expose weather-aware toggles because players already treat skies as a signal: drink after you see the event is live, not while you hope it might start.

Practical weather habits:

1. Glance at the event / weather indicator before opening potions.
2. If a favorable sky is up, clear inventory and free a display slot first.
3. Pop mutation vials that match the variants you still need.
4. Optionally stack a 2x or 4x luck potion from the merchant once Cash clears upgrade floors.
5. Cast with sharp perfect cast timing for the full timer.
6. Stop when the buff or weather ends — do not “almost” start a second vial tired.

Bad habit: drinking Diamond or Rainbow the moment you join a quiet server with no event, then AFK-selling everything. You paid for a museum piece and bought scrap instead.

When to pop vials during weather

Pop now

• Weather / event banner is visibly active
• You have a planned index hole (missing Sandy fish, first Gold of a family, etc.)
• At least one display stand is free
• Perfect cast warm-up already feels consistent
• Bounties ask for rare or mutated tags you can finish during the window

Wait

• Merchant just refreshed a 4x you cannot afford until one more sell pass
• Rope Length still fails the water band you want to farm
• Bag is full of unsorted junk that will force a blind Sell All
• You are about to rebirth and wipe rules for trophies are still unclear

Never stack blindly

Do not chain every mutation vial you own in one sitting “because weather is up.” Pick the one variant that advances index or gallery goals, pair it with luck if Cash allows, and bank the rest for the next event.

Index and display synergy

Mutations shine when collection systems talk to each other:

• Index wants unique entries — first mutated copy of a family is sacred.
• Display stands protect that copy from Sell All and show server visitors what you hunt.
• Tier lists help you decide which families deserve permanent stands once duplicates appear — see tier list and items and rarity.
• Rewards / bounties often pay for rare tags that weather + mutation sessions complete faster — track claims on rewards and index.

Workflow that works:

1. Open index; note two or three missing mutated entries.
2. Check weather.
3. Buy or retrieve the matching vial.
4. Cast only while focused.
5. Display first copies immediately.
6. Sell true duplicates after index credit is safe.

That loop turns random shiny pulls into deliberate checklist progress.

Keep versus sell mutated items

Use this triage every time a mutated catch lands:

Result	Default action	Exception
First mutated copy of a family	Display / bank	None — protect it
Duplicate mutation, average weight	Sell for Cash	Keep if gallery wants a matching pair
Heavier mutation than your displayed twin	Swap onto stand; sell or bank the lighter	—
Mutation during a pure Cash emergency	Still keep the first copy	Sell only extras
Event-only mutation	Display until you screenshot and index	Sell extras after the event ends

Rule of thumb: if the mutation would annoy you on someone else’s base wall, do not sell your only copy to fund a single Luck rank.

Cross-check payout instincts with item values so “looks expensive” and “sells for enough” stay honest.

Stacking order with luck potions

Recommended order for a weather hunt:

1. Permanent Luck already reasonable for the week’s goal
2. Rope / Power breakpoints satisfied (upgrades)
3. Perfect cast warm-up (about ten clean hits)
4. Claim dailies / bounties / playtime gifts that might grant vials
5. Merchant gap-fill if needed (merchant)
6. Pop mutation vial targeting the index hole
7. Pop 2x/4x luck
8. Cast; display keepers live; sell junk when the buff ends

Reverse that order and you will watch timers tick in the upgrade menu.

Free potions, codes, and mutation stock

Join the official Roblox community for the advertised 3 free Luck Potions before you burn Cash on merchant luck. Those free vials pair beautifully with a paid mutation vial during weather. Typed promo codes remain unconfirmed as of November 2026 — watch codes rather than inventing strings. When a code eventually grants mutation or luck stock, bank it for the next event sky instead of chugging in the menu.

Patch awareness

Sweg Magnets ships frequent UPD-style title tags. Mutation odds, weather schedules, and vial names can move. After a big patch:

1. Read updates and patch notes.
2. Re-check tooltips on every vial you own.
3. Retest one short weather session before dumping a full Cash stack into Diamond.
4. Update keep/sell thresholds on the tier list if new variants appear.

Common mistakes

• Popping Rainbow with zero free display slots
• Selling the first Gold because “I can roll another”
• Ignoring weather and drinking vials on dead skies
• Stacking three mutation types in one confused session
• Judging a vial after five casts instead of a full timer
• Skipping luck and potions and treating mutations like permanent Luck

Related pages

• Luck and Potions — timers and permanent Luck
• Merchant — buying vials without breaking Cash floors
• Display Base — parking mutated trophies
• Tier List · Items and Rarity — keep priority
• Updates — retunes after weather or mutation patches

Play the sky, pick one vial with intent, and let mutations fill the gallery that plain Cash grinding never will. Weather is the schedule; mutations are the paint; your display wall is the proof.