Earthquake Dragon's last ability can be activated only if it is in your graveyard.
Earthquake Dragon
The total cost to cast Earthquake Dragon is locked in before you pay that cost. For example, if you control three Dragons, each with mana value 4, including one you can sacrifice to add {C}, the total cost of Earthquake Dragon is {2}{G}. Then you can sacrifice the Dragon as you activate mana abilities just before paying the cost.
If a permanent has {X} in its mana cost, X is 0 when calculating its mana value.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Johan Grenier
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