It needs more creatures that work well with spells so you get damage in early with Guttersnipe and have a card like Giant Koi as an option to finish the late game, where it attacks unblocked because of waterbending
As such, I've done some reading online, but may present some elements slightly inaccurately
Hunting Velociraptor If youve ever seen Jurassic park, you know just how scary these things can be
Beledros Witherbloom does produce Pest tokens, but seven mana is a high price to pay for a commander
Cloud, Midgar Mercenary does a very good job of imitating it, but its infinitely more difficult to build around Cloud in Limited
Basking Broodscale sees play as part of a combo deck that goes infinite with the Eldrazi and Blade of the Bloodchief, forming a simple loop that often wins with Glaring Fleshraker or Walking Ballista