diff --git a/src/run.js b/src/run.js
index 84db902..a5d3542 100644
--- a/src/run.js
+++ b/src/run.js
@@ -1,4 +1,4 @@
-import { getAllCards, getStarterDeck } from "./cards.js";
+import { getAllCards, getCard, getStarterDeck } from "./cards.js";
 import { createMap } from "./map.js";
 import { shuffle } from "./state.js";
 
@@ -27,6 +27,29 @@ export function campfireRest(run) {
   return { ...run, hp: Math.min(run.hp + 3, run.maxHp) };
 }
 
+export function campfireSmith(run, cardId) {
+  const card = getCard(cardId);
+  if (!card?.upgraded) return run;
+  const idx = run.deck.indexOf(cardId);
+  if (idx === -1) return run;
+  const deck = [...run.deck];
+  deck[idx] = card.upgraded;
+  return { ...run, deck };
+}
+
+export function getUpgradableCards(run) {
+  const seen = new Set();
+  const result = [];
+  for (const id of run.deck) {
+    if (seen.has(id)) continue;
+    seen.add(id);
+    if (id.endsWith("+")) continue;
+    const card = getCard(id);
+    if (card?.upgraded) result.push(id);
+  }
+  return result;
+}
+
 export function revealRewards(run) {
   const count = Math.min(3, run.cardRewardsDeck.length);
   const revealed = run.cardRewardsDeck.slice(0, count);
diff --git a/src/run.test.js b/src/run.test.js
index a5bf0dd..e9d154b 100644
--- a/src/run.test.js
+++ b/src/run.test.js
@@ -3,8 +3,10 @@ import { getAllCards, initCards } from "./cards.js";
 import { initEnemies } from "./enemies.js";
 import {
   campfireRest,
+  campfireSmith,
   createRunState,
   endCombat,
+  getUpgradableCards,
   pickReward,
   revealRewards,
   skipRewards,
@@ -104,6 +106,57 @@ describe("campfireRest", () => {
   });
 });
 
+describe("campfireSmith", () => {
+  test("replaces first occurrence of base card with upgraded version", () => {
+    const run = { deck: ["strike_r", "strike_r", "defend_r"] };
+    const result = campfireSmith(run, "strike_r");
+    expect(result.deck).toEqual(["strike_r+", "strike_r", "defend_r"]);
+  });
+
+  test("does nothing if card not in deck", () => {
+    const run = { deck: ["defend_r", "bash"] };
+    const result = campfireSmith(run, "strike_r");
+    expect(result.deck).toEqual(["defend_r", "bash"]);
+  });
+
+  test("does nothing if card has no upgrade", () => {
+    const run = { deck: ["bash+", "strike_r"] };
+    const result = campfireSmith(run, "bash+");
+    expect(result.deck).toEqual(["bash+", "strike_r"]);
+  });
+
+  test("smiths strike_r from full ironclad starter deck", () => {
+    const run = createRunState("ironclad");
+    const originalCount = run.deck.filter((id) => id === "strike_r").length;
+    const result = campfireSmith(run, "strike_r");
+    expect(result.deck).toContain("strike_r+");
+    expect(result.deck.filter((id) => id === "strike_r")).toHaveLength(
+      originalCount - 1,
+    );
+    expect(result.deck).toHaveLength(run.deck.length);
+  });
+});
+
+describe("getUpgradableCards", () => {
+  test("returns unique base cards that have upgrades", () => {
+    const run = { deck: ["strike_r", "strike_r", "bash", "defend_r"] };
+    const result = getUpgradableCards(run);
+    expect(result).toContain("strike_r");
+    expect(result).toContain("bash");
+    expect(result).toContain("defend_r");
+    // duplicates deduplicated
+    expect(result.filter((id) => id === "strike_r")).toHaveLength(1);
+  });
+
+  test("excludes already-upgraded cards", () => {
+    const run = { deck: ["strike_r+", "bash+", "defend_r"] };
+    const result = getUpgradableCards(run);
+    expect(result).not.toContain("strike_r+");
+    expect(result).not.toContain("bash+");
+    expect(result).toContain("defend_r");
+  });
+});
+
 describe("rewards", () => {
   test("revealRewards removes 3 from rewards deck and returns them", () => {
     const run = createRunState("ironclad");