This card is used mostly in decks that like to copy spells for the Expansion side, and its nice to have that on rate with the potential upside of the other half
All this sacrificing means youll also probably want some Recursion, too, so consider adding cards like Black/Green cards that will help you get things back from your Graveyard such as Phyrexian Reclamation, Greenwarden of Murasa, Reclaim, Regrowth or Skeleton Shard
Its probably not a deck for newcomers, though, because the sheer volume of triggers can feel overwhelming
Also, low mana value changelings do exist
Proceed accordingly, but again, focus on the Showcase versions and not the regular frame
It also has a death trigger, its a lot cheaper on the mana, and it has the fun dredge