Try not to use your SR+ FGM if they come very rare for you.
When maxing attack cards, 2 Excellent Power Ups with SR+ FGM will only save your 1 ULT moogle. You need 9 SR boosted after the second reincarnation, so now you need (9-1) - 2 = 6.
For now, there is no way to conserve cards until a Wonderful show up. No matter how many HP SR+ cards you use, the amount of fusions will not even reach the stats 1 SR FGM boosted moogle can give. So my answer is 6, until you got a Wonderful you can ask me again.
Thank you so much Kazr10!