There will be situations where a player may not even attack with the 10/10+ creature because of combat tricks or blockers, because its incredibly easy to just mill a player out of the game after this thing boards without placing it at risk
Control decks will often negate any of the advantages that first strike would give

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Golems Fighting-type advantage isnt particularly relevant, as it can already one-shot strong lightning, dark, and normal Pokemon like Ex Wigglytuff, Ex Pikachu, and Muk regardless of their weakness