When Purphoros enters the battlefield, your devotion to its color (including the mana symbols in the mana cost of Purphoros itself) will determine if a creature entered the battlefield or not for abilities that trigger whenever a creature enters the battlefield
Turning all your artifacts into Mox Sapphire and coming into play with a massive artifact creature is great, but its activated ability gives you an outlet for all that surplus mana
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Also, if youre able to make Kecleon somewhat durable, attaching Expert Belt to it would really help to give it more HP and increase its damage output
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But when it does fire off, its among the most backbreaking swings any Ninja can manage, turning an unblocked 1/1 into 10+ mana of creatures on the spot