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However, overconfidence is prohibited because it is weak against exclusion and bounce

If you see some card with an HP of 13000 or an attack that does 900 damage, its fake

You can only chose a given option once a turn, but it's not restricted to your turn, so a timely Auroral Procession or Unbury can create a surprise blocker or extra card advantage

So you could probably play an entire game with a normal deck with a lot of items and just be fine, because you've been able to build it with that in mind

Negate the effects of all face-up monsters while they are face-up on the field (but their effects can still be activated).

If you control a "Firewall" Link Monster (Quick Effect): You can banish Link Monsters from your GY whose combined Link Ratings equal exactly 3