You have to play a decent chunk of creatures to get the maximum value out of each one of her abilities, so I guess were looking at some sort of Bant, Temur, or Sultai midrange
The system isn't perfect and it occasionally pairs you up or down to ensure you find a match, but it generally keeps things balanced and helps prevent new players with a small collection from playing against completely maxed-out decks
A Birds of Paradise from that sheet went for 4+k, and considering there are some huge dragon collectors (including the gentleman who owns the Shichifukujin and a couple of his friends) around, Im certain the Shivan breaks 10k
Save up these Pack Points and use them to purchase specific cards from the shop that are needed
On the plus side, allies want as many cheap friends as they can get
Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.) Sorcery Kindred - Shapeshifter Titania's Command Choose two Exile target player's graveyard