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This works due to the wording of their tag-out effect, because of the wording both of the tag-out targets are special summoned at the same time

But at the beginning you might only have 5, which is still a +1000 attack boost and thats good, but nothing to write home about

Special Summon it, also, for the rest of this turn, you cannot activate the effects of monsters Special Summoned from the Extra Deck, except "Tenyi" monsters

While on the field, essentially, no effects can be activated until any Extra Deck, Ritual, or Pendulum Monsters are on the field

Slim, compact and ultra-light

Not only is it a useful card for stopping plays, but being able to use it during your opponents turn, could do more than protect your monsters