For most decks, being restricted to only cards that cost three or more means that Keruga, the Macrosage has the same exact issue as Gyruda, Doom of Depths: you only get to play a single card over the first three turns of the game, leaving you in a position where you're often dead to aggressive decks (this gets even worse in older formats, which are faster and place a higher value on efficiency)
That said, with such a scarcity of common payoffs, drafting blue-red comes with some risk
There are nearly 300 creature types in Magic: The Gathering, ranging from the pretty obscure Trilobites to the ever-present Humans and Elves we see in just about every set
The Cub is also perfectly posed to look like a toddler, and that little extra bit of humanity really helps you feel for it
This should give you a hint as to the power this card holds
Synergizing with creatures with Trample, like many dinosaurs, Quartzwood Crasher is capable of creating some absolutely massive tokens