if the Pokmon Spike Energy is attached to is in the active spot and is damaged by an opponent's attack (even if it is KOd), you get to put two damage counters on the opponents attacking Pokmon
Well, its about half as good as connecting with Fallen Shinobi, except you get to fill your deck with powerful cards if you want, so its pretty great
You can only use this effect of "Odd-Eyes Advance Dragon" once per turn
By checking recent sales, you can get a feel for the current demand and find a realistic value for your own cards

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