The ability to return the card exiled with Ugin's Labyrinth to its owner's hand just by tapping the land - not even sacrificing it
Cards in different categories help you fill up your inkwell, which means you can put your more powerful characters into play
Because replacement effects can modify the life gain and life loss, this number may be different from what it was before the exchange
If you chose Besotted Knight, and the spell resolves, it will enter the battlefield under your control
Of course every deck has 5 Planeswalkers of their character, as well as their flip variant
Similarly, while you do have like three cards that support it, I don't think Zada, Hedron Grinder fits as well here as it does in, say, Feather, the Redeemed