Should I upgrade Spur in Slay the Spire 2?

Compare the upgraded text: Retain. Summon 5. Osty heals 7 HP.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.

What builds use Spur?

Spur appears in 2 tracked builds: Osty's Warband (A-tier, core card), Soul Harvest (B-tier, flex pick).

What character uses Spur?

Spur is tagged as a Necrobinder card. See the Necrobinder build hub for archetypes that care about it.

Updated for Data 2026-03-17Early Access — numbers may shift with patches.

Spur

Necrobinder · Skill · Uncommon · 1 cost

Base

Upgraded

Card text

Retain. Summon 3. Osty heals 5 HP.

Spur+

Retain. Summon 5. Osty heals 7 HP.

Builds that use Spur

Archetypes that draft this card in real runs, with the role it plays.

Keywords

Retain Summon

Build context

See the Necrobinder build hub for archetypes that feature this card in real runs.

Related cards

Spur FAQ

Should I upgrade Spur in Slay the Spire 2?: Compare the upgraded text: Retain. Summon 5. Osty heals 7 HP.. If the upgrade lowers cost, adds damage/block, or enables a combo piece, it is usually high priority.
What builds use Spur?: Spur appears in 2 tracked builds: Osty's Warband (A-tier, core card), Soul Harvest (B-tier, flex pick).
What character uses Spur?: Spur is tagged as a Necrobinder card. See the Necrobinder build hub for archetypes that care about it.

Patch history

SpireForge snapshots card text from Untapped exports dated 2026-03-17. When Mega Crit ships a balance patch, we re-run the scraper and refresh every affected URL—see /patches for the editorial log.