Marvel Snap 卡牌升级机制详解：稀有度阶梯、Booster、Credits 与拆分

Upgrading cards is the engine of progression in Marvel Snap — it’s how you climb your Collection Level, unlock more cards, and customize your collection. Here’s the system, the costs, and how it ties to your growth.

What an upgrade does

Spending Boosters + Credits on a card raises its visual rarity tier. Each rarity step:

• Changes the card’s border/visual treatment.
• Adds Collection Level, which drives your progression (unlocking cards and advancing pools).
• Eventually unlocks splitting at the top tier.

The rarity ladder, bottom to top:

• Common → Rare → Epic → Legendary → Ultra → Infinity

Developer note: the elegant part of this loop is that upgrading cosmetics IS the progression. You’re not grinding a separate XP bar — making your cards look cooler literally pushes your collection forward. This front-loads satisfaction (visible reward each upgrade) while back-loading the rarest visuals.

The two currencies: Boosters and Credits

• Boosters are card-specific. You earn them for a particular card through play and the booster-pin system. They can only upgrade that one card — they don’t pool across your collection.
• Credits are the universal upgrade fuel. You spend Credits alongside Boosters on any card.

This split is intentional: Boosters nudge you toward upgrading the cards you actually play (the ones you earn boosters for), while Credits let you choose where to spend globally.

How upgrades drive progression

Every upgrade adds Collection Level. Collection Level is the gate that:

• Unlocks new cards as you climb.
• Advances you through card pools (see our Series/Pools guide).
• Determines the reward track you draw from.

So upgrading isn’t a side activity — it’s the way you grow your collection. The question is rarely “should I upgrade?” but “which card should I upgrade?”

Which card to upgrade (the practical rule)

• Upgrade cards you actually play in your main deck — you earn boosters for them naturally, and the Collection Level gain is identical regardless of card.
• Don’t hoard Credits at the cap — if you’re at the Credit storage ceiling, spending on any upgrade is better than letting potential progression evaporate.
• Split cards you’ve maxed when you want to keep pushing Collection Level on a staple you’ll play forever.

The takeaway

Upgrading is the cosmetic-and-progression loop folded into one. Spend Boosters (card-specific) + Credits (universal) to climb a card’s rarity, each step adding Collection Level that unlocks more of the game. Upgrade the cards you play, never sit at the Credit cap, and split maxed staples to keep progressing — that’s the whole engine.