You do need to have some amount of board presence established for this to end the game, but it doesnt take too many creatures for this to overwhelm a table beneath a flurry of hooves, paws, and other things to make a lake of your table
Nashi, Searcher in the Dark An evasive 2-drop that gets bigger and fills the graveyard, Nashi, Searcher in the Dark from Duskmourn: House of Horror plays like a powered-down Psychic Frog, which has been more than viable in its home formats of Modern and Legacy
The deck then adds powerful creature token generating spells to quickly grow a massive army
Rolling Stone
If Blue, Loyal Raptor and Owen Grady, Raptor Trainer are your commanders, your deck may contain cards with green, blue, and/or red in their color identity, but not white or black