Would you save it in your cargo in hopes of using it on a Dyson(if you find one)? Or would you use it on something like a MC Oceanic or a C Gaia instead?

i used mine on a 22x mc arti ocean, might save my last rifter when i get it to use on a nat dyson instead

[quote="Adsibearsawsome"]i used mine on a 22x mc arti ocean, might save my last rifter when i get it to use on a nat dyson instead [/quote

This.
Ideally one with ring, or at least ruins.
I did mine like this:
tranfuse VL un-uplifted icy until you get ring(or until say however many tries you are willing to pay for, either via GP or for another player and pick the best one)
QSE that planet twice
uplift it to 15/20/15 or as close as you can (the difficulty is mining, not very important but can't uplift individually unless you are using that racial, which few ppl do, 20 arti and 15 res are ez and a must)
melt it
we are done. If you want to apply some other fun toy to it, feel free to do so.

If you have a partner, you can have him take the planet for a bit(or rather whoever was selling you transfuser/QSE) and apply any after-invasion-only stuff to it. Similarly, you can pass it aorund a bit to get the "at least x other ship scanned" condition met. Whoever occupied it first can put the calm-required artifacts before the invasions for control change etc begin.
TL;DR of this last part: plan what you think is optimal building scheme ahead, and perform whatever sequence of action required to get them all on there.

x36+ap

I used mine on a 40x/29x/32x Dyson. I scanned it as unoccupied right before my 2 year anniversary.

It was a SIGN.

And yeah, I'd generally agree that it's best to use one on a supergood Dyson if possible.