Since Moritte enters the battlefield with two +1/+1 counters when it copies a creature, there are some wild strategies with creatures that have the persist ability
Attack with Gholdengo exs Make it Rain, which does 50 damage for each Energy card your discard from your hand
In November last year, it formed part of the Temur Floodcaller combo deck, a Standard strategy that - while it now only forms a small part of the meta - was briefly very popular, likely in part because it had the potential to pull off an infinite combo in the low-powered Standard environment
Mime [Series 1] #122 Pokemon Japanese Vending Keep track of your collection value over time
But after digging through Wizards of the Coast's preview materials, developer interviews, and design documents, that increasingly appears to be the point
Bernie: I thought it was kind of cheap, too