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You can only use this effect of "Power Tool Mecha Dragon" once per turn

You should bring a tournament-legal Deck as described above, along with any tournament supplies you will need, such as paper and pen to track Life Points, dice or counters if you are using cards which require them, extra sleeves to replace any that become damaged, and so forth

This card gains 1000 ATK for each monster on the field

Generic Ritual Spells & More To close things out, here's a list of Ritual Spells that aren't bound to the name of a specific Monster, ordered by their utility

The Side Deck in Yu-Gi-Oh

Once per turn you can detach an XYZ material to target a card on the field, or in either players graveyard, and return it to the hand