They charge ten cents for commons
In a deck with black creatures, and especially creatures like Blood Artist, the flip could be very costly to one of your oppokn For the front card, a cheap equipment will do if all you want is to satisfy the flip condition
Other usual rules for Constructed decks apply which are: Minimum of 60 cards in the main deck Maximum 250 cards for main decks Up to 15 cards in your sideboard, if used Include no more than four copies of any individual card in your main deck and sideboard combined (except basic lands) In order to be legal in this format, a card needs to be available at common or uncommon rarity on MTG Arena
For those formats, look to Atraxa, Grand Unifier, who has vigilance and deathtouch on top of flying and lifelink, and an almost-as-powerful card draw effect
I do enjoy the pun though