Decks I would recommend Drapion V to be played in: Lost Zone Box, Lugia VSTAR Penny Penny is quickly becoming one of my favorite cards in Standard because it works as a pseudo-Switch card, a way to manage your resources, and a way to heal
Attacking with Dragons draws you cards and can drop extra permanents for free, so combat turns into a steady stream of value instead of swing and pass. Focus heavily on early ramp and color fixing so the cost reduction matters as early as possible
That's always my starting point, which is then tweaked to suit the individual deck's strategy and further tweaked with playtesting
You have very little wiggle room for cards that don't interact with the board directly, so keep things like pure card draw spells and discard spells to a minimum
How much enabling do you put in the library, vs payoff
Chromatic Armor really does feel like a card that should have multi colours