1. Each card has a “level”. The higher the level, the more resources NFT brings.
  2. During the merge, the player has a chance to improve the rarity of NFT:**

Merging 3 common cards gives the player a 20% chance to get a rare card of the next level or an 80% chance to get a common card of the next level.

Merging 3 rare cards brings a 10% chance of getting an epic card of the next level or an 90% chance to get a rare card of the next level.

Merging 3 epic cards brings a 100% chance to get an epic card of the next level.

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Also, players can merge 5 cards which will give them 2 cards of the next level with rarity improvements by following chances:

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