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(2) The other pro is that giving your opponents more cards in situations where one of your opponents is in the lead makes it much easier for the table to gang up on them and set them back, and in situations where you're in the lead you can simply choose not to ring the bell just to maintain your advantage

If you think you have one of these rare holographic, gold star, or base set cards, then the first step to take before even thinking about selling them is getting the cards professionally graded

Morpho Butterspy X DARK Level 4 [ Warrior / Effect ] ATK 1200 DEF 1600 Once per turn, when the battle position of an opponent's monster(s) is changed (except during the Damage Step): You can target one of those monsters

My advice is to play four in any green deck that cares about poison in the slightest