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You can only use this effect of "Yasha, the Skeletal Mayakashi" once per turn
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
An eight scale is one of the best scales you can have, as it's so high that you will be able to pendulum summon almost any monster in your deck
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
It can be used to get additional upkeep triggers but at the same time falls short of my doubling ability definitions