EARTH
9Gem-Knight Master Diamond
Archetype:
Gem-
ATK:
2900
DEF:
2500
View:
1861
3 "Gem-Knight" monsters Must first be Fusion Summoned. This card gains 100 ATK for each "Gem-" monster in your Graveyard. Once per turn: You can banish 1 Level 7 or lower "Gem-Knight" Fusion Monster from your Graveyard; until the End Phase, this card's name becomes that monster's, and replace this effect with that monster's original effects.
Gem-Knight Master Diamond — Power Evaluation
Final Score: 48 ± 8 · Confidence: Medium
- Intrinsic: 44 · Deck: 50 · Meta: provisional
- Primary role: Boss/End-board
Why it scores here
Master Diamond is a Fusion boss whose power comes from being a reliable Gem-Knight endpoint: it is in 100% of the 400 sampled decks, almost always with the Gem-Knight Fusion support cards, and its one recorded board is a one-card-into-six-monster end-board. Its 2900 ATK and the +100 ATK per Gem- in the Graveyard earn little on their own, because the card needs three Gem-Knight materials and has no interaction, card advantage, or material value. The Graveyard copy effect adds flexibility, but it is once per turn and only works if the Gem-Knight shell is already in place. The score is held down by the archetype lock and by the single combo sample, which makes the combo conversion reading thin.
Axis scores
| Axis | Score | Evidence |
|---|---|---|
| Accessibility | 60 | Fusion Summon needs three Gem-Knight materials and it is present in 400/400 decks with Gem-Knight Fusion at 98%, but there is no searcher and no starter role appearance in the combo data (observed). |
| Combo & Conversion | 75 | The single recorded combo uses it as payoff and end-board piece with power index 100, but one sample is too thin to trust the conversion rate (observed, thin sample). |
| Resource Economy | 35 | No draw, search, or card-advantage text; the Graveyard ATK boost and the once-per-turn copy are not card advantage (verified from text). |
| Effect & Interaction | 15 | The description has no negation, removal, or lock, so it gives the opponent no interaction (verified from text). |
| Material Utility | 15 | As a Fusion monster it is not a normal material body, and the evidence has no material usage for it (inferred). |
| Resilience & Flexibility | 45 | The copy effect offers some multi-turn flexibility, but it is once per turn and removing the monster's effects ends that flexibility (inferred from text). |
| Deck-Building Efficiency | 45 | It is one copy in TCG and DuelLinks, but running it means building around Gem-Knights, a restriction that is seen in the archetype usage data (observed, inferred). |
Calculation
Weight profile: Boss/End-board profile (single primary role, no secondary roles). Intrinsic ≈ 44, Deck ≈ 50, Meta = provisional. Modifiers: Archetype-locked restriction (-3). Final formula: 0.40*Intrinsic + 0.60*Deck
Strengths
- Appears in 400/400 sampled decks, with Gem-Knight Fusion present in 98% of them.
- Its one recorded combo is a one-card board with power index 100.
- The Graveyard copy effect offers flexibility, including the option to become a lower-level Gem-Knight Fusion.
Weaknesses
- Needs three Gem-Knight materials and cannot be reached without the Gem-Knight shell.
- Has no negation, removal, or card advantage.
- Its high ATK earns little by itself, since the 2900 base is not what drives the score.
- The combo evidence is a single sample, which limits confidence in the conversion rate.
Counters / choke points
- Hand traps and negations that stop the Fusion Summon or the Graveyard copy in the opponent's turn.
- Graveyard hate, since the ATK boost and the copy both draw on the Graveyard.
Best use
End-board Fusion boss that copies a lower-level Gem-Knight Fusion when needed. Decks: Gem-Knights (archetype 240), Gem-Knights (archetype 607), Gem-Knights (archetype 436). Suggested copies: 1.
Evidence & gaps
- Verified: Fusion Summon requires three Gem-Knight materials (card text).; +100 ATK per Gem- in the Graveyard (card text).; Once-per-turn Graveyard banish of a Level 7 or lower Gem-Knight Fusion to copy its name and effects (card text).; One copy legal in TCG and DuelLinks (legal copies).
- Observed: Present in 400/400 sampled decks, with a single copy in almost all of them (deck data).; Gem-Knight Fusion present in 98.2% of decks (top partners).; Appears in one combo as payoff and end-board piece with power index 100 (combo data).; Usage inclusion 66.7% and 85.7% in the Gem-Knight archetypes (usage statistics).
- Inferred: Its power depends on the Gem-Knight shell rather than on the card alone.; Its copy effect is a flexibility tool rather than an interaction tool.
- Data gaps: no guides supplied combo data contains a single combo sample, which is too thin for a stable conversion rate