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For each damage dealt

Not only is this attack boost permanent (meaning you can destroy more monsters every single turn), but this guy is completely indestructible to battle or card effects

With only 74 copies known to exist in circulation, its no surprise to see Tropical Wind realizing astronomical prices in auction

Theres many more that are in the deck list, but these are some of the most powerful

Lastly, the Zombie Dragon does come with Flash allowing you to use the card as a blocker in a pinch

Three damage to any target for one mana is too good of a deal to ignore, and most decks that can run this effect will run some number of them