Is it just me, or does every card seem to need a buff these days after the new shards came out?
If that is the case, that strongly implies that the shards are overbalanced and are more powerful than they should be.
Overbalanced? Did you mean overpowered?
And if you meant overpowered, yes, I think we should think of ways to nerf those cards rather than buff every other card in the game. (as I feel we're trying to do slowly but steadily)
Regarding Shards and how they compare to other cards:
I think the ideas of power creep and psychological standard sum this up the best, as seen in the
Top Comment on MTG's Baneslayer Angel. The idea is that if you keep releasing more powerful cards for the next generation, you come to accept these new powerful cards at the standard (Which leads in to powercreep, where better cards replace old ones.) Consequently we look on what might be 'practical' cards as obsoleted by the broken ones that draw everyone's attention. (Thought not strictly better due to their 'instant' speed Explosion and Steal tend to be used less than SoFo since SoFo can go 1-for-3 (1-for-4 if you're counting the Black Hole) in terms of cards, while Explosion and Steal are 1-for-1 and 1-for-2 respectively..)
Ontopic:
IMHO Mitosis does not need a buff in any form : if you compare Adrenaline, Mitosis has the ability to repeatedly copy a creature while Adrenaline produces no additional copies. Since token cards don't exist in ETG, you're technically getting card advantage out of a successful Mitosis whereas an Adrenaline'd creature will be a sitting duck for CC. (This is most notable with Reverse Time : against Mitosis, you still have another creature on the field so you at least have 1 card to 'pay back' for the Mitosis used. Against Adrenaline, you've waste two cards.) Adrenaline should have a 1
advantage to even this possible anti-CC advantage out.