Quote from mondu_the_fat »For something that wins the game in limited, this costs too low. Make it non token or something. because right as it is you'll never run out of tokens.
Also: a 0/0 token that immediately dies still puts a summoning counter on it. So, you don't even have to have a creature in play in the first place. Just generate a 0/0 token to charge it up.
You're right it probably should be nontoken to stop such abuse.