After my initial rejection of the idea, I think this new set of cards can set an interesting precedent
Even when youre not gaining life, its still a two-drop mana creature with three toughness, and it taps for any color mana, so its excellent for early mana fixing in a three-color deck
There's also the reality that you don't get to pick copies
This includes permanents that phase out in ways other than the first ability, and even permanents that are phased out already when it enters the battlefield
While it would be fantastic to be able to take out a Baneslayer Angel with one card, let alone getting five damage on the face as well I fear that getting to seven mana before said Baneslayer has ended the game will not be happening
You can use Carrion Feeder as the outlet, build up infinite power, then Fling it for the win