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The easy answer is a mix of math and opportunity cost

Without the ability to leave many creatures back on defense, it drives the game very quickly to a conclusion

For ramp I actually would avoid most of the traditional mana rocks outside of Sol Ring, Arcane Signet, Fellwar Stone

Notably, the commander tax is paid in life rather than mana, so recasting her is never prohibitively expensive

I might also be tempted to run a planeswalkers build but I looked through the Blue/Green planeswalkers and didn't see anything that jumped out at me

Impulse drawing can give huge card advantage, but the bonus here is that if you dont play the exiled cards, you can deal direct damage to each opponent