Upgradable

"Upgradable" is an unofficial term used to refer to cards that transform themselves into a more powerful version when a specific action is performed while the card is in a player's hand.

While no official keyword is used to denote the ability, precisely the same text is included on all of the Spellstone cards from the Kobolds & Catacombs expansion: (Do something to upgrade).

Upgradable cards first appeared as a brand new feature in the Kobolds & Catacombs expansion.

Notes

• Any progress towards upgrades will be carried over into the card. For example, when you play an elemental with a fresh Lesser Ruby Spellstone, you will need to play one more elemental to upgrade it, and the card text will reflect it.
• The cards will upgrade whenever an instance triggers an upgrade. For example, a Lesser Amethyst Spellstone will upgrade each time Spreading Madness hits your hero.
• The cards cannot skip an upgrade level. For example, you cannot upgrade a Lesser Jasper Spellstone into a Greater Jasper Spellstone by gaining 6 Armor at once.
• Cost reduction effects that have been applied to the card (Ex. Primordial Glyph, Emperor Thaurissan) will not carry over when upgraded.
• If the card meets its upgrade requirement as it is added to your hand, it will be upgraded. (i.e. Ultimate Infestation will upgrade Lesser Jasper Spellstone as it is drawn, and Chittering Tunneler will upgrade Lesser Amethyst Spellstone when it is discovered.)

Cards

Collectible

These cards are the Tier 1 upgradable cards.

Name / Desc	Rarity	Type	Subtype	Class	Cost	Atk	HP	Description
Lesser Amethyst Spellstone	Rare	Spell		Warlock	4			Lifesteal. Deal 3 damage to a minion. (Take damage from your cards to upgrade.) A purple stone Azari carved For dark hearts, craving, power-starved. The first to bow, the warlock Rin, Embraced the darkness, slew her kin.
Lesser Diamond Spellstone	Rare	Spell		Priest	7			Resurrect 2 different friendly minions. (Cast 4 spells to upgrade.) A diamond, white, this stone the eighth A precious jewel for those of faith A whispered prayer restores the lost But none among them know the cost.
Lesser Emerald Spellstone	Rare	Spell		Hunter	5			Summon two 3/3 Wolves. (Play a Secret to upgrade.) An emerald stone for Tauren hands Who sought its strength to save their lands Their tribes now lost, their rage released Who's hunting now? And who's the beast?
Lesser Jasper Spellstone	Rare	Spell		Druid	1			Deal 2 damage to a minion. (Gain 3 Armor to upgrade.) In ancient woods, elves fought the curse The demon's shadow to disperse But hatred raged and frail souls turned Now horned and hooved their forests burned.
Lesser Mithril Spellstone	Rare	Spell		Warrior	7			Summon one 5/5 Mithril Golem. (Equip a weapon to upgrade.) To dwarves of stone the demon called With promises of might, enthralled In grasping greed they found their doom Forever bound in mithril tombs.
Lesser Onyx Spellstone	Rare	Spell		Rogue	5			Destroy 1 random enemy minion. (Play 3 Deathrattle cards to upgrade.) The trolls of old embraced the gift A jewel of black for daggers swift No party lasts who finds the stone Those wielding it soon stand alone.
Lesser Pearl Spellstone	Rare	Spell		Paladin	2			Summon a 2/2 Spirit with Taunt. (Restore 3 Health to upgrade.) In ages old, when Ancients broke Azari of the Legion spoke To tempt the mortals: gems of power The weak succumbed, their souls devoured.
Lesser Ruby Spellstone	Rare	Spell		Mage	2			Add a random Mage spell to your hand. (Play two Elementals to upgrade.) The final stone undid its master Spun into wards by nameless caster Azari wailed a savage roar Now sealed in nether, evermore.
Lesser Sapphire Spellstone	Rare	Spell		Shaman	7			Summon 1 copy of a friendly minion. (Overload 3 Mana Crystals to upgrade.) A stone of blue, embraced with glee By murloc lords beneath the sea Soon numberless they swarmed the shore First two, then four, then more...and more...
Showing all 9 cards

Uncollectible

These cards are coincidentally the Tier 2 upgradable cards.

Name / Desc	Rarity	Class	Cost	Description
Amethyst Spellstone	Rare	Warlock	4	Lifesteal. Deal 5 damage to a minion. (Take damage from your cards to upgrade.)
Diamond Spellstone	Rare	Priest	7	Resurrect 3 different friendly minions. (Cast 4 spells to upgrade.)
Emerald Spellstone	Rare	Hunter	5	Summon three 3/3 Wolves. (Play a Secret to upgrade.)
Jasper Spellstone	Rare	Druid	1	Deal 4 damage to a minion. (Gain 3 Armor to upgrade.)
Mithril Spellstone	Rare	Warrior	7	Summon two 5/5 Mithril Golems. (Equip a weapon to upgrade.)
Onyx Spellstone	Rare	Rogue	5	Destroy up to 2 random enemy minions. (Play 3 Deathrattle cards to upgrade.)
Pearl Spellstone	Rare	Paladin	2	Summon a 4/4 Spirit with Taunt. (Restore 3 Health to upgrade.)
Ruby Spellstone	Rare	Mage	2	Add 2 random Mage spells to your hand. (Play two Elementals to upgrade.)
Sapphire Spellstone	Rare	Shaman	7	Summon 2 copies of a friendly minion. (Overload 3 Mana Crystals to upgrade.)
Showing all 9 cards

Fully upgraded

These cards are the Tier 3 fully upgraded cards.

	Cards
By type	Hero card Minion Spell Weapon
By class	Druid Hunter Mage Paladin Priest Rogue Shaman Warlock Warrior
By minion type	All Beast Demon Dragon Elemental Mech Murloc Pirate Totem General
By ability	Adapt Auto-Attack Auto-cast Battlecry Can't attack Cast spell Casts When Drawn Charge Choose One Choose Twice Combo Copy Deal damage Deathrattle Destroy Discard Discover Divine Shield Draw cards Echo Elusive Enrage Equip Forgetful Freeze Gain Armor Generate Immune Inspire Joust Lifesteal Magnetic Mega-Windfury Modify cost Overkill Overload Permanent Poisonous Put into battlefield Put into hand Quest Recruit Refresh Mana Remove from deck Replace Rush Restore Health Return to hand Secret Shuffle into deck Silence Spell Damage Spend mana Start of Game Stealth Summon Taunt Take control Transform Unlimited attacks Upgradable Windfury
By effect type	Area of effect In-deck effect In-hand effect On-discard effect On-draw effect Ongoing effect Positional effect Random effect Resurrection effect Triggered effect
By card set	Basic Classic Journey to Un'Goro Knights of the Frozen Throne Kobolds & Catacombs The Witchwood The Boomsday Project Rastakhan's Rumble
	Hall of Fame Naxxramas Goblins vs Gnomes Blackrock Mountain Grand Tournament The League of Explorers Whispers of the Old Gods One Night in Karazhan Mean Streets of Gadgetzan
By rarity	Free Common Rare Epic Legendary