Breach the Bastion Spire Deck Builder Deck Building Guide
Consistency first—archetype focus, smart skips, removals, and relic synergy for Bastion climbs.
Great Breach the Bastion runs are won in the draft, not only in the boss room. This Deck Building guide teaches a Spire-like discipline: choose an archetype, keep the deck thin enough to draw it, and let relics amplify the plan. Pair it with How to Play for turn basics and Getting Started for first-run habits.
Consistency beats collection
Every card you add competes with your best cards for draw slots. A twenty-five card pile with five win conditions loses to a lean pile with two. Ask three questions on every reward screen:
- Does this card advance my archetype this act?
- Can I afford the energy and draw cost of carrying it?
- Would skipping raise my average turn quality?
If the answer to (3) is yes more often than you like admitting, you are learning correctly.
Pick an archetype early
Name the plan in one line:
- Block engine: defend into safe damage; upgrades go on core defends and draw.
- Burst / finish: front-load damage to delete elites before scaling.
- Status / brew: Brewer Spores, Spore Burst, Steam packages that win across turns—see Brewer Class.
- Support seat: Stand Guard, team regen, potion discipline in Co-op.
Do not draft a block engine and a greed infinite “just in case.” Hybrids appear later when relics force them—not on floor one.
What to add
Early act
- Low-cost cards that always do something useful.
- One reliable AoE if hallway multi-enemy nodes appear often.
- Draw or brew setup only if you already survive intents.
Mid act
- Payoffs that spend the resources you generate (energy relics, Alembic-style block conversion, Steam Engine loops).
- A second damage beat so you are not stuck chipping bosses forever.
Late act
- Specialized answers (artifact strip, big block, burst) once the skeleton is online.
- Avoid random legendaries that do not talk to your relics.
Brewer examples that often earn their slot when the plan matches: Spores, Spore Burst (AoE + regen), Steam Burst, Alembic (brew → block), Stir, Quick Draw, Glass Shards, Shell Breaker, Steam Engine. Skip them when you are not actually brewing.
What to skip
Skip high-cost cards before you have energy relics. Skip situational hate pieces for problems you have not seen. Skip “cool but off-plan” rares that force a second archetype. Skipping is free thinning—use it.
Removals and thinning
Removals at shops/events are often stronger than adding a new common. Delete the starter cards you outgrew first. A deck that draws its business every turn outscales a deck that keeps dead strikes forever. If gold is tight, prefer one removal over two mediocre buys.
Relic synergy
Relics should steer future card picks:
- Energy relics → suddenly high-cost payoffs become legal.
- Draw relics → you can afford slightly thicker packages.
- Block/heal relics → safer elite pathing (Beat Elites).
- Brewer-adjacent pieces like Happy Flower or Ember Strike (region changes near the cauldron) push you toward brew positioning and map choices that keep the cauldron relevant.
Evaluate relics with the rubric on Relics Tier List. Community rankings on the Tier List Hub are November 2026 opinion snapshots, not patch notes—cross-check Updates after balance changes.
Upgrades
Upgrade the card you play every fight, not the flashy one-of. Typical priority: primary damage scaler → primary block/brew converter → draw enabler → flex cards. Rest sites that offer upgrades compete with healing—see How to Play for the HP vs power trade.
Potion pocket as part of the build
Your “deck” includes potions. Holding a strength/block/cleanse potion for elites is a build choice. Popping everything in hallways is a build mistake. Coordinate potion banks in co-op so roles stay clear.
Multiplayer drafting
In four-player runs, duplicate greedy rares starve the party. Draft complementary kits: one cover specialist, one elite deleter, one flexible hallway clearer. Class vibes sit on Classes Tier List and Players Hub; Brewer identity continues on Players Brewer and Brewer Update.
Anti-patterns to avoid
- Taking every rare “for value.”
- Ignoring removals until the boss.
- Building for a relic you do not have yet.
- Copying a streamer’s infinite without the enabling rare.
- Forcing Frog Parasite while the deck is still a starter pile.
Practice drill
Run three climbs where you may add at most one card every other fight unless it is on-plan. Notice how often your key cards appear. Then loosen the rule once you feel the difference. Use Run Checklist under Tools to track skips and removals.
Related resources
Guides Hub · Codes · How to Redeem · Scripts · Auto Combat · Links · Wiki
Draft with intent, thin with courage, and let relics finish the sentence your cards started.
Frequently Asked Questions
Quick answers to the most common questions.
How big should my deck be?
Lean enough that you see core cards most fights. Exact counts vary, but if you often draw dead starters, remove or skip before adding more.
When do I start taking rares?
When they complete your archetype or a relic suddenly enables them—not simply because they are rare.
Are Brewer cards always good?
Only if you are committing to brew/spore/steam lines. Off-plan Brewer cards still clog draws like any other mismatch.
Should I mirror my co-op partner's deck?
No. Complement roles—cover, burst, and flexible hallway tools—so the party answers more intents.
Where do tier lists fit into drafting?
Use them as opinionated hints after you understand your plan. Patch notes on Updates always outrank old rankings.