Choose by the reason you die
If you lose to isolated hits, Vitality adds eight maximum HP per level. If crowd damage ends a run, Attack adds 4% to the permanent attack multiplier per level. Cooldown subtracts three percentage points from the permanent cooldown multiplier per level. Speed adds 3% per level. These are per-partner bonuses, not run evolution cards.
Cost formula
The next cost at zero-based purchased level L is round(base × growth^L ÷ 10) × 10. A base-60 Vitality purchase costs 60, then 80, then 110 coins. The table lists every next purchase and the total cost to reach the cap.
Buy a meaningful option
Repertoire costs 1,500 coins and adds one starting move. Reroll adds a level-card reroll per run; Banish blocks a chosen move from level-up offers. Their value depends on how often unwanted cards interrupt your planned evolution. No source proves one universal best purchase order.