While there are times when it could be a double-edged sword, Solemnity also stops things like poison counters from adding up, keeping you alive in other ways as well
(It won't transform, though.) If this card somehow enters the battlefield with its back face up, it didn't transform, so you won't get an emblem
For example, starting with a two-drop Ichor Wellspring you can get a three-drop like Chromatic Lantern if you need to smooth your mana or a combo piece like Ashnod's Altar or Phyrexian Altar or Crucible of Worlds
Magic: The Gathering has an active community and a scene that is constantly evolving (which is just one reason for it being amongst the best card games ever made)
Other cards like Ajani's Last Stand also play around discard nicely
Discover which clan fits your playstyle with Tarkir's distinct three-color gameplay