A Giovanni would be nice, as that would allow Electivire to one-hit KO Palkia from full health, but a little chip damage from Magnemite would achieve the same result
Here are the colors as they appear in order from rarest to least rare: three-color, red, purple, blue, green, and yellow
Taps for a white, black, or green
Later, you can get a 4/5 flier with haste for 5 mana, which is on-rate for your usual rare or mythic dragon anyway
Instead, you can pay a whole bunch of money (although probably a smaller amount than you would unless you live within driving distance of the convention) to get all the cool loot that you would have grabbed in Philly
No matter the platform, remember to check the key factors: platform fees will impact your final profit, ease of use determines how much time you spend, and the audience size and focus will dictate your cards demand