Gem System Overview
Gems are special enhancements you attach to cards at the Blacksmith. First add a gem slot to a card (costs coins), then purchase and slot a gem from the shop or Blacksmith. A single card can hold multiple gems, making gem setup the primary way to power-spike your core cards.
There are 63 gems total, split across five rarity tiers:
| Rarity | Count |
|---|---|
| Common | 9 |
| Uncommon | 12 |
| Rare | 19 |
| Very Rare | 8 |
| Ultra Rare | 9 |
Higher rarity means stronger effect — and tougher unlock requirements.
Priority Ranking
S Rank — Game-changers
Wild — Turns its card into a wildcard that fits any cost position without breaking the combo chain. Universally strong; eliminates the most common cause of failed combos.
Free To Play — Makes the attached card cost 0 mana. Attach it to your highest-cost finisher and you can fire it regardless of mana state. Combine with Return for an infinitely recurring, free card every turn.
Return — Card returns to hand after use. On a Mana Book, this creates a permanent mana-refill loop. The foundation of the strongest infinite-engine builds.
A Rank — Chase these actively
Echo — Replays the effect of the card played immediately before. Slot it after a big weapon in your combo sequence to double the damage. The real gain is multiplicative since combo multiplier applies to both plays.
Triple Damage — Triples damage on the attached card. On a single-target heavy hitter at high combo depth, the math becomes enormous.
Decimate — Deals 10% of the enemy's max HP. Independent of normal damage scaling, so it reliably chunks even the tankiest bosses.
Draw — Draw 1 card after playing. Keeps your combo chain flowing and prevents dead hands mid-combo.
Yin Yang — Even-cost card played: gain 1 mana. Odd-cost card played: draw 1 card. Benefits virtually every hand composition, making it one of the best all-round gems.
B Rank — Strong in the right deck
Evolution — Evolves the attached weapon. If you are building toward any evolved weapon, this gem is mandatory on that card.
Magnetic — Draw 1 extra card when you have another copy of this card in hand. Excellent in duplicate-heavy decks.
Leader — Draw a random card at the start of combat. Mild consistency boost for any deck wanting more hand size.
C Rank — Situational
Retain / Recycle — Depend on holding a large hand size. Strong in dedicated big-hand builds, otherwise niche.
Countdown / Magic Hat — Reward spamming a specific card. Only useful when that card is a core part of your strategy.
Best Gem by Card Type
| Card Type | Top Gem | Why |
|---|---|---|
| High-cost finisher weapon | Free To Play / Triple Damage | Removes mana gate; triples damage |
| Mana Book | Return | Returns each turn for permanent mana loop |
| 0-cost area attack | Wild | Inserts anywhere without breaking combo |
| Mid-combo card | Echo / Draw | Doubles effect or refills hand |
| Boss-focused card | Decimate | Scales off boss max HP |
| Evolution-target weapon | Evolution | Required to trigger evolution |
Full Gem Unlock Conditions
| Gem | Unlock Condition |
|---|---|
| Wild | Play 150 Wild cards → obtain Jester's Hat arcana first |
| Free To Play | Play 200 Free-to-Play cards |
| Return | Unlocked by default |
| Echo | Play 3,000 cards total |
| Copy | Play 1,000 cards total |
| Triple Damage | Deal 500,000 total damage |
| Decimate | Deal 666,666 total damage |
| Leader | Deal 100,000 total damage |
| Draw | Unlocked by default |
| Evolution | Unlocked by default |
| Magnetic | Purchase from shop |
| Yin Yang | Clear Berserk Wood |
| Midas | Collect 5,555 coins |
| Mug | Collect 3,333 coins |
| Coin Count | Collect 100,000 coins |
| Crawler Caller | Clear Library Sanctum |
| Fireproof | Clear Curd Refinery |
| Countdown | Play Empty Tome 321 times |
| Magic Hat | Play Peachone (Pure White Dove) 77 times |
| Retain | Hold 7 cards in hand |
| Recycle | Hold 8 cards in hand |
| Easy Combo | Achieve combo 5 or higher |
How to Unlock the Blacksmith
To attach gems, you need two relics first:
- Gem Hammer — Required to attach any gem to any card. One of the highest-priority early relics.
- Stardust Anvil — Spawns the Blacksmith in the village, where you add slots and attach gems.
Once the Blacksmith is open, spend coins to add slots to your key cards, then buy gems from the shop or directly from the Blacksmith. Gem loadouts persist between runs, so invest once your core deck strategy is clear.