Except that MMan did 110 damage - very respectable - and was a counter to Yveltal on top of what it did. Also could be boosted by Max Elixer. Also there was battle comp so easier to get specific energy in the discard to power up, say, something with specific energy requirements (Joltic, Glaceon, Regice, Ho-Oh).
This card needs a DCE and only does chip damage, unless you're a joltic, and it's harder to search out and get specific energy in the discard to power up something specific. This theory deck would need to play 4 DCE, and would only play mono-color on top of that. Sounds clunky.
Ooh, free retreat tho.