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You can only use this effect of "Yasha, the Skeletal Mayakashi" once per turn

There are eight castable card types in the game, after all, which means it could theoretically draw you eight cards in a single turn

I believe Zekrom will remain the main attacker in most Zekrom decks, but Zekrom EX can be used to take out key pokemon in an opposing deck's infrastructure, allowing Zekrom, which is already known for taking an early lead, to then finish off the rest of the pokemon

Other than helping protect your life points, this effect gives you a chance to set up your field with Monsters that limit your opponents options