Its a Constructed-caliber, flexible removal spell that fits into any deck
It does most of what a Fiend/Maggot does with their EtB effects and then it is better at staying in play, far better at blocking, enables raid, controls planeswalkers and is generally a pain in the arse
Apex Altisaur can also theoretically hurt a lot of critters, and Fiery Confluence can clear boards of tokens, but you should generally expect to be on the receiving end of a board-clearing effect
Here are the steps that happen while an evoke creature is being cast for its evoke cost: You cast a creature for its evoke cost
Basically, these are cards you can find in booster packs, but are not standard legal
Some recent commanders that might want to consider this card in the 99 include Ellivere of the Wild Court and Galadriel, Light of Valinor