Usually when a spell or ability wants you to discard your hand, you want said hand to be as empty as possible. With that tap ability on the back assuring you can get your creatures back, that might not be as necessary.
How does the finality counter work with Together Forever? It should still be exiled because of the wording right? Seems like a replacement effect. Or can I choose the order of the trigger effects when dying?
Edit: Yeah, I am certain that the creature would be exiled when dying... The finality reminder text starts with "If..." while the effect of Together Forever starts with "When...".
Looks like a pretty good card! The front side is Yawgmoth, Thran Physician at home, but you're really here for the backside, and quite a few (part-)black decks dump their hands quickly enough to flip this in the mid-game.