You may use Rydia's special ability by discarding an Earth Summon instead of discarding a [Card Name (Rydia)] as part of the cost.
Gaia's Hammer ([S], 3 CP, Dull): Deal 7000 damage to Forwards of all Elements except Earth.

• Number: 2-094H
• Rarity: H
• Card Type: Forward
• Attribute: Earth
• CP Cost: 3
• Power: 7000
• Title: Summoner