If you eventually want to join local store tournaments, you will want to focus your purchases on active Core-legal sets like Whispers in the Well, Winterspell, or Wilds Unknown
This functionally makes Twinflame Tyrant a 6/5 flying Dragon, but more importantly, turns all your other damage dealt into twice as much
Instead, you have to hope you draw the card again if you want to cast it as a creature
Because Helm of Obediences ability only stops milling once it has either milled X cards or a creature, if you have a replacement effect in play that exiles cards when they go to the graveyard, the Helm never sees either of its conditions met, and it just mills the entire library
This is a lot to pay, but this ability can be activated as many times as its controller wants, though it has to be at sorcery speed
Bugenhagen's second ability checks at the moment it would trigger to see if you control a creature with power 7 or greater