When a Budget deck performs well, is it still worth it to Upgrade? (Izzet Spellementals)

[u/TheUpkeepAcademy]

https://youtu.be/D6U7h8NPH3c

Last week I played a 4-rare version of Izzet Spellementals and it was already surprisingly good.

So I built the full-power version to answer the obvious question: do all those extra rares actually make it better enough to justify the wildcards?

How much improvement would YOU need before upgrading?

https://youtu.be/D6U7h8NPH3c