Blast of Genius is a pretty sweet new build around, but it is not without counter play
Any Equipment will become unattached and remain on the battlefield
In order to remain competitive within the pace of the game, therefore, you would likely need access to Green for land and creature-based ramp, which is why we've not yet seen a cEDH list that scrambles through artifacts at this time
With the correct colored partner to add + or + you gain access to effects that let you assign damage based on toughness, you can turn Prava into a permanent that provides your tokens +4/+4
The last effect of Brudiclad's triggered ability affects all tokens you control other than the chosen token, including the token that was just created if that isn't the chosen token
Milling not just one, but all opponents for eight cards for only two mana is already decent value, but later in the game, paying the kicker cost mills a massive amount of cards