On the positive side, redoing old mechanics allows Wizards to smooth things out for new players
Any ability that says a player wins or loses the game still works
Many such cards have a triggered ability that transforms the card (when it's on the battlefield.) One of the most typical such ability is " at the beginning of each upkeep, if no spells were cast last turn, transform (this card) ." Many players actually don't realize that this is a normal triggered ability that uses the stack, and therefore can be responded to
Having very little control over how much life you are paying and how many cards you are getting is not a great advertisement for a cards
Iraxxa is one of three token-generators in the deck, the others being Faldorn, Dread Wolf Herald and The Lost and the Damned
Quaeritis is a great monster to finish your board with since it can reduce all monsters ATK to zero except Level eight monsters, meaning all of your Branded Fusion Monsters will keep their ATK since they all share the Level eight stat line