For example, if you discover 4 and reveal Galvanic Giant (an adventurer card from Wilds of Eldraine with a mana value of 4), you could cast Galvanic Giant, but not Storm Reading (its Adventure, which has a mana value of 7)
We're going to get so much value out of every populate card that they won't know what hit them
Conversely, when Protean Hulk dies, you can search your library for creatures with total mana value 6 or less and put them directly onto the battlefield
They know that if they both survive, they'll find themselves on opposite sides once again
And if you cast it normally, its still a solid body
He's incredibly cocky, has a really obnoxious theme song, duels with a deck called "I'm Ronald!" and is incredibly easy to beat into the dirt