What the Necrobinder does
She is a summon-and-stack character. Osty fights in front of her, and Doom does the finishing work.
She has 88 cards in the current build. That is the same count as the Silent, the Regent and the Defect, and one more than the Ironclad.
The card pool by type
Power cards are the largest group here. That matters, because her scaling comes from persistent effects rather than single swings.
| Rarity | Attack | Skill | Power | Total |
|---|---|---|---|---|
| Basic | 2 | 2 | 0 | 4 |
| Common | 12 | 8 | 0 | 20 |
| Uncommon | 12 | 15 | 9 | 36 |
| Rare | 8 | 10 | 8 | 26 |
| Ancient | 1 | 0 | 1 | 2 |
| Total | 35 | 35 | 18 | 88 |
The three mechanics
Doom appears on 13 cards. It stacks on enemies, and Time’s Up converts the stack into damage.
Osty carries 12 of her attack cards, plus one token. None of them deal damage themselves, so his survival is the whole engine.
Summon appears on 12 cards and is how Osty returns. Soul appears on 10.
Where the power sits
Thirteen of her cards carry Exhaust, which ties with Doom as the most common mechanic in her pool. That is the built-in brake: her effects are strong because they are one-shot.
The Rare and Ancient slots hold the finishers. End of Days applies 29 Doom to every enemy, and Reaper Form converts your attack damage into Doom for the rest of the fight.
The 12 cards that Summon
These are the recovery cards, and they matter more here than on any other character.
| Card | Cost | Effect | Upgraded |
|---|---|---|---|
| Afterlife | 1 Energy | Summon 6. | Summon 9. |
| Bodyguard | 1 Energy | Summon 5. | Summon 7. |
| Cleanse | 1 Energy | Summon 3.; Exhaust 1 card from your Draw Pile. | Summon 5.; Exhaust 1 card from your Draw Pile. |
| Devour Life | 1 Energy | Whenever you play a Soul, Summon 1. | Whenever you play a Soul, Summon 2. |
| Dirge | X Energy | Summon 3 X times.; Add X Souls into your Draw Pile. | Summon 4 X times.; Add X Souls+ into your Draw Pile. |
| Invoke | 1 Energy | Next turn, Summon 2 and gain 2 Energy. | Next turn, Summon 3 and gain 3 Energy. |
| Legion of Bone | 2 Energy | ALL players Summon 6. | ALL players Summon 8. |
| Necro Mastery | 2 Energy | Summon 5.; Whenever Osty loses HP,; ALL enemies lose that much HP as well. | Summon 8.; Whenever Osty loses HP,; ALL enemies lose that much HP as well. |
| Pull Aggro | 2 Energy | Summon 4.; Gain 7 Block. | Summon 5.; Gain 9 Block. |
| Reanimate | 3 Energy | Summon 20. | Summon 25. |
| Sic ‘Em | 1 Energy | Osty deals 5 damage.; Whenever Osty hits this enemy this turn, Summon 3. | Osty deals 6 damage.; Whenever Osty hits this enemy this turn, Summon 4. |
| Spur | 1 Energy | Summon 3.; Osty heals 5 HP. | Summon 5.; Osty heals 7 HP. |
How to build her
Pick a lane. A deck that splits between Osty attacks and Doom application does neither well, because the two want different cards in hand.
If you take the Osty line, Calcify is the card that makes it work, and Sacrifice is the one that ends it.
On the Doom side, the two room-wide cards are Deathbringer and End of Days.
Where to go next
Osty and his 13 cards covers the summon line. Doom covers the stack. Cards database lists every card in full.