Here are the 3 Sapphire Spellstone cards added to the Shaman class from the Kobolds and Catacombs expansion.
You upgrade the card when you overload 3 mana crystals giving you better value for the mana cost each time.
They then summon the following number of friendly minions:
Lesser Sapphire Spellstone – Summon 1 copy of a friendly minion
Sapphire Spellstone – Summon 2 copies of a friendly minion
Greater Sapphire Spellstone – Summon 3 copies of a friendly minion
