Upgrade card

The Upgrade card is used in some crafting recipes to craft combination a cards.

Rarity

 * Hard packs - Almost Impossible
 * Mech packs - Extremely Rare
 * Plantera pack - Very Very Rare
 * Post-dungeon packs - Very Rare
 * War packs - Rare
 * Next-Gen packs - Very Uncommon
 * Legendary packs - Uncommon