For starters, it's a good card, letting you draw cards by simply playing your deck for what is ultimately not too much of a cost, and in some cases even acts as lifegain
Can balance be restored before the sun sets for good? Cast powerful double-sided creatures with the power to transform on the battlefield
Pair this with any deck that already likes Cauldron Familiar or Mayhem Devil, and your opponent will not last long
While Karn and Narset ended up restricted in Vintage and Teferi banned from several formats, it was the tantalizing trickster who wound up banned in Standard, Pioneer, Modern, Historic, and Legacy
However, look towards Sire of Insanity and some upgrades in the removal suite to keep Jund as a top contender!