I probably wouldn't write anything like that. It is a bit too Fanfic for me, and I honestly just don't know the MCU lore well enough to write MCU fanfic.
And even if you wanted to write something like that, I wouldn't use a resource system or anything like that. If I were to write a Yugioh and MCU crossover fanfic, I'd limit the summonings in other ways.
Mainly something like having summoning drain a ton of stamina from the summoner, or maybe even directly taking away from their 'life force'. (life force would regenerate over time, but use too much too quickly and you die.)
And since there would/should also be some backlash to the summoners life force whenever a summoned monster dies, you'd have to be careful not to summon too many monsters at the same time, and also be careful with how powerful monsters you summon. (more powerful monsters would take more life force to summon, but are less likely to be taken down.)
Something like that just fits better in the MCU where all the 'magic' isn't really magic, but instead specific kind of science. But again, not something I'd write.
Out of curiousity, are you intending to still add the remaining iterations of Blue eyes? I noticed quite a few are absent, or maybe he just hasnt unlocked them yet. Otherwise i cant see him dragging his feet on unlocking them all.
Are you a Yugioh card player? Like damn, it's kinda rare to find people who plays the card game irl. It's fun to see some people who does yugioh stories.
Found this a few days ago and as remembered you did a YUGIOH series i thought you would like it : https://www.youtube.com/shorts/tVRL5OsKrJI (it is not a trap link, i swear)
Hi there. I'm just writing to congratulate you for creating a great and interesting novel . Hoping for the best for you and waiting for the new chapter . Thank you for your hard work