At only two mana, the advantages that this guy provides to a deck with all of the same type of creatures is astronomical, primarily because the +1/+1 counters don't go away when the Mimic dies
Goblins will attempt to hit critical mass swiftly, and it's possible to end up with literally hundreds of Goblin tokens on the battlefield, thousands if the match goes long enough
That body would have a hard time cracking Standard, let alone Modern
Or even rules text
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4 Knight of the Ebon Legion 4 Kitesail Freebooter 3 Seekers' Squire 4 Yarok's Fenlurker 2 Lurrus of the Dream Den 4 Ayara, First of Locthwain 4 Murderous Rider 4 Phyrexian Obliterator 1 Ravenous Chupacabra 1 Dread Presence 4 Gray Merchant of Asphodel 1 Cavalier of Night 20 Swamp 4 Castle Locthwain 1 Massacre Girl 4 Brain Maggot 1 Cavalier of Night 2 Ravenous Chupacabra 2 Plaguecrafter 2 Tymaret, Chosen from Death 2 Blast Zone 1 Umori, the Collector Most mono-black devotion decks follow a certain progression up the curve in order to work
