I like the last one.
I don't know how the AI would play it, but Fallen Druids would have been nice there. Mutate Micros who aren't used with Butterfly Effect and mutant your opponent creatures to make them killable by Maxwell's Demons. (In case your nymphs don't show up or meet CC).
Good idea - I'll probably throw those in next time I try an Entropy-Life duo.

"...I don't think my decks are that good..."
They don't have to be good. 
They have to be interesting and fun to play against.
Interesting and fun aren't mutually exclusive from "challenging" and "actually able to win battles to sustain ratings". ^^;
 | Level | 76 | Health Points | 1/180 | Max Upgraded | 60 | Oracle Upgraded | 5 | Mark Multiplier | 3X | Card(s) per Turn | 2X | Deck Size | 2X |
| Win:Loss | 28:10 | Electrum Earned | 492 | Rank | 599 | Rating | -124 | Age (days) | 8 | Thumbs Up? | 13 | Thumbs Down? | 15 |
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7dg 7dg 7dg 7dg 7dg 7dm 7dm 7dm 7dp 7dp 7dp 7dp 7dp 7dp 7dq 7dq 7ds 7ds 7ds 7ds 7ds 7ds 7du 7du 7du 7du 7du 7f2 7f2 7f2 7gq 7jp 7jp 7jp 7jp 7jp 7jp 7n0 7th 80a 8po
A slightly larger Immo-Phoenix deck with Seraphs for added damage and some basic 1 quanta cards for utility - mainly to kill off major attackers with lightning, stop fractal-based decks, and nullify SoSa/Poison spammers. Of course, just like the RNG of Fog Shield, I don't know if everyone who faced my deck even encountered those cards before they won or lost.