Mythic rares concentrate multiple effects or scaling power into a single card
This means that while aggro decks are winning sooner than midrange and control (which is objectively correct, even when decks are as close to parity as possible in regards to power), they are doing so much more often because their boards arent being dismantled enough
Alternatively, you can make the life swap itself lethal: by running cards prevent you from losing for having less than 1 life, like Phyrexian Unlife or Platinum Angel, you can lower your life total to 0 and swap totals with your opponents, immediately killing them
Killing a prominent threat is deece, and it can draw a card in a manner synergistic with cards like Prosper, Tome-Bound or Don Andres, the Renegade
Tormenting Voice Here's a question for my readers: how many of you remember the original Furby hype