When it enters and connives, it can bounce a spell back to someones hand, which can completely shift a turns momentum
Not having to pay the mana cost for them and being able to give them haste is more than enough to win games in any format
There are plenty of ways to play them off the top of your library, like Oracle of Mul Daya or Augur of Autumn
Id like to look at them regardless, but they arent nearly as much of a sure thing to survive the banning as Jeskai Fires
Jace, the Living Guildpact Using the graveyard like an extra resource is where Jace, the Living Guildpact feels most at home
Izzet Looting While many of the Izzet strategies of last year were focused on prowess creatures, this year, we're all about drawing cards or pitching them into the the graveyard