Fossil Essence
EARTH Level 1 ATK/0 DEF/0 Rock/Tuner:
Once per turn, you can select one face-up monster on the field. The Attribute of this card becomes the same as the selected card's Attribute until the End Phase. If this card is in your graveyard, during your End Phase, you can reveal a "Ocean Fossil" or "Molten Fossil" in your hand to Special Summon this card from your graveyard.

Ocean Fossil
WATER Level 4 ATK/1400 DEF/1600 Rock/Effect:
When this card is destroyed, Special Summon 1 "Molten Fossil" from your Deck, and increase it's ATK and DEF by 500 until the End Phase.

Molten Fossil
FIRE Level 4 ATK/1600 DEF/1400 Rock/Effect:
When this card is destroyed, Special Summon 1 "Ocean Fossil" from your Deck, and increase it's ATK and DEF by 500 until the End Phase.

Excavate Earth
Normal Spell Card
Reveal 1 Rock-Type monster in your hand. Add 1 Rock-Type monster from your Deck to your hand.

Ocean Fossil Beast
WATER Level 5 ATK/1900 DEF/2100 Rock/Synchro/Effect:
WATER "Fossil Essence" + "Ocean Fossil"
Your opponent can't select another monster you control as an Attack Target. When this card destroys a monster by battle, add 1 Rock-Type monster from your graveyard to your hand.

Molten Fossil Beast
FIRE Level 5 ATK/2100 DEF/1900 Rock/Synchro/Effect:
FIRE "Fossil Essence" + "Molten Fossil"
Your opponent can't select another monster you control as an Attack Target. You can discard a Rock-Type monster from your hand to destroy 1 monster your opponent controls.