Finally, I dont think Teferi, Time Raveler is problematic in terms of power level, but I want to see it go because of play patterns (or lack thereof) it creates
It makes it a decent cantrip by fixing the hand in the starting turns of the game, and later can be an enabler for combos in an Archlight Phoenix Jeskai deck or in an Esper Reanimator list
The deck focuses on using weenie unblockable creatures to quickly play prowl cards or repeatedly use cipher triggers
Even if you do manage to track one down, well-conditioned copies go for as high as $4700 dollars
While Heroic Intervention might be too costly an upgrade for creature protection, all that is truly needed is to protect your Commander Bello
Sometimes it wont come online until Turn 4, but thankfully a Force Spike will do early on