Megarock Dragon's Effect
* Effect 1: When this card is Normal or Special Summoned: You can destroy 1 monster your opponent controls.
* Effect 2: If this card is in your Graveyard, you can banish 1 "Megarock" monster from your Graveyard; Special Summon this card from your Graveyard.
X700's Effect
* X700 monsters have a special summoning condition. When you Normal Summon an "X700" monster, you must send 1 "X700" monster from your Deck to the Graveyard.
The Interaction:
There's no direct interaction between Megarock Dragon and X700 monsters. They don't share any specific keywords or effects that trigger each other.
However, here's how they could be used together strategically:
* Summoning Megarock Dragon: If you have "X700" monsters in your Deck, you could send one to the Graveyard by Normal Summoning an "X700" monster. This sets up Megarock Dragon's effect, allowing you to Special Summon it from the Graveyard.
* Megarock Dragon's Destruction Effect: Megarock Dragon's effect can destroy any opponent's monster, potentially targeting an "X700" monster, if needed.
* "X700" Monster Support: Some "X700" monsters have effects that involve sending cards from the Graveyard to the Deck. These effects could potentially be used to return Megarock Dragon to the Deck to reuse its effect.
In short, Megarock Dragon and X700 monsters don't directly interact, but they can be used in conjunction with each other strategically, depending on your deck build and the game situation.