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It first really showed up in a non-gimmick deck at the World Championships in 2013

Reveal the card picked by your opponent, and if it was a monster, add it to your hand or Special Summon it, or if it wasn't, banish it, also shuffle the rest into the Deck

So how should you build your sideboard with Dredge in mind

The same is true for the colors of the spell, the colors of a split card are both colors everywhere EXCEPT on the stack when being cast, where only the cast part(s) colors are used

Just as importantly, youll see how to tell whether your own cards have value, and where the affordable-but-valuable ones are easiest to find