Everyone and their mother has seen Yarok do Yarok things
It started off most prominently in green and black, but has since become more universal across different colors
If you don't need to find ways to spend spare mana late game then there is little point taking those early game risks
As it is, its really good in squirrel decks like Chatterfang or Hazel, and you can even conjure it with Euru, Acorn Scrounger on MTG Arena
Spells with this kind of effect are becoming increasingly problematic in Magic - if seven mana additional turn spells like Nexus of Fate and Alrund's Epiphany can get banned, it's easy to see why Time Walk is so scary
Creature - Goblin Soldier Color tag templates(None) Mogg War Marshal Echo (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When this creature enters or dies, create a 1/1 red Goblin creature token