What about exploiting a pillar denial tactic in rainbow?
Here is one way:
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This deck is really funny, and has to go fast to be ready to bounce back anything that comes in play, while destroying pillars: that's why i limited it to 30 cards.
I chose time mark because of eternities high cost, even if entropy would make deck faster with more supernovas.
For damage i put fire eaters for two reasons: they exploit two quanta otherwise missing, and they are easily rewindable to avoid decking out because of their low cost.
I made this deck because poseidon's power is terrific, but difficult to exploit. This is just a beginning, because this deck needs more creature control (no anti creature
spells and no killing cards can be really bad sometimes) but it's a good start!
Enjoy