The need to constantly keep up with a metagame and replace old cards with new, to play what is optimal it also alienates players from their favorite cards and decks, and makes them feel that the version of Magic they know and enjoy is gone
6 | Banner Of Kinship Mana Value: 5 Rarity: Rare Card Text: As this artifact enters, choose a creature type
Two thirds of Taigam's Scheming, even if you can do it to opponents library's isn't generically useful
We also have Rogue's Passage in case we're going in on attacking with Toluz, and High Market if someone dares to attempt to Exile her, keeping us from getting our hand back
In addition, the two elements the design team wanted, a feeling of transformation and the idea of having parallel mortals and spirits, could still be done with the flip cards
Step 1: Figure out what you have