You can sacrifice a weak Rat to get the token generation going, as once the ability is used once it'll progressively get stronger as more Rats are put into play
Despite this blue has good ways to regain lost card advantage and far fewer good ways to gain tempo making this a good filler card to help all manner of quirky blue dork decks
1: Target creature gets +X/+X until end of turn, where X is the number of creatures you control
Although the Dinosaur token enters the battlefield attacking, it was never declared as an attacking creature (for the purposes of abilities that trigger whenever a creature attacks, for example)
And anyone with fundamental commander knowledge can likely pilot it just fine
The back half, Itlimoc, Cradle of the Sun, taps for green mana equal to your creature count, which is exactly what Gaeas Cradle does