Dion, Bahamut's Dominant / Bahamut, Warden of Light Without transformation, Dion, Bahamut's Dominant represents a respectable 5 power in the air
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In formats that dont care about colour identity, like Standard and limited formats, a Room may be a good reason to splash outside of your regular colours
It may drain all of Zapdos' energy, but can be a game-clincher if a foe has two or fewer prize cards left and this knocks out one of their high-powered Pokemon
An attacking creature must also defend from a blocking creatures power in the same way
Leaving mana open is that much more important and you will have some tap lands you need room to get down