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Make sure to follow the instructions to the tee, though, otherwise, you may find yourself having to restart the duel because you didn't follow the script

MiDoremichordo Eritia Level 3 WATER Pendulum Effect: The Pendulum Summon of your "Doremichord" Monsters cannot be negated

For example, Purrely Delicious Memory will grant the additional bonus of an added 300 ATK/DEF for each card attached to said monster alongside the spell's standard effect

None, I'd use them accordingly to my deck's synergy

Once per turn: You can discard 1 card, and if you do, banish this card

There are a tonne of deck combinations in YuGiOh , but only a relative few can stake the claim of being the best, meaning you'll need to find the right synergy between the different cards and archetypes