Nether Drake question

Hi everyone,

I have a question in regard of Nether Drake card: “At the end of your turn, give your Dragons +1 Attack and upgrade this”. What “upgrade this” means? I have a youtube video with a game where this card is used and at the minute 8:35 "the card “Efficient Engineer” is used on Nether Drake which boosts his attack from 20 to 46 and I don’t understand where the difference of 26 came from. I know the guy in the video has “Brann Bronzebeard” and “Drakkari Enchanter” but still the boost is way bigger.

https://www.youtube.com/watch?v=mOMgGBmrRBc

Upgrade this means it starts at giving +1, then the next turn it gives +2, then the next turn +3, etc.
Because the upgrade is an end of turn effect, the enchanter doubles the effect (so each turn the upgrade is 2 instead of 1). Because it’s an end of turn effect, efficient engineer + enchanter triggers the upgrade twice. Because of Brann the engineer triggers the upgrade 4 times… etc.

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Thank you.
I watched the video again and at the minute I was saying (8:35) Nether Drake had +5 Attack. So after it is triggered 4 times : +5 +6 +7 +8 = +26 the sum is correct.