One of Metaphys's main strengths, the effect of Special Summon is to remove all of the opponent's monsters
Synchro Summons: Unlike other Summoning Methods, Synchro Summon is perhaps one of the most versatile, as players can opt not to use their monsters and Tuners for the summoning anyway
Synchro of Unity is very good when chaining card effects together to get those Synchro cards on the field as quickly as possible
And not only that, Arf can also destroy set monsters as well, which brings forth additional synergy with flip-down cards like Loading
However, with immense time and effort, players can digest all the game's complicated rules and become good players
By excluding this card from the Golden Chest, you can delay the effect timing of any of his Metaphys from your opponent's turn to your turn