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Some grading companies look at a card with the perspective of "Curb Appeal" and some are very picky in their approach

[spoiler=EN008 - Vennominaga the Deity of Venomous Snakes] LV 10 DARK Reptile Effect Monster ATK: 0 DEF: 0 "Vennominon the King of Venomous Snakes" + 1 "Venom" monster Must be either Fusion Summoned, or Special Summoned by sending the above cards you control to the Graveyard (in which case you do not use "Polymerization"), and cannot be Special Summoned by other ways

But these counters also represent Domris toughness, so if your opponent attacks Domri and the card suffers damage, you lose one counter for every point of damage sustained

If youre looking for easier ways to Synchro Summon, Synchro Material is a new Trap Card that lets you use your opponents monster to do your own Synchro Summon