That doesnt seem very funny at first, but imagine all of the whacky possibilities
When Kaalia, Zenith Seeker enters the battlefield, look at the top six cards of your library
Combine a Cloudstone Curio, Phyrexian Altar, Life Finds a Way, mana, and a nonartifact creature token, and you can make token copies of your creature through population, then the Altar uses a neverending resource to pay for the Dreadnought again
Of course, getting up to the 14 loyalty needed to use this ability will be incredibly difficult without ways to speed up the process (such as proliferating yourself), or with a big enough army to protect Karn from attackers for the two turns needed to set him off
Wizards of the Coast has its own written stance on proxies, in which they state: Wizards of the Coast has no desire to police playtest cards made for personal, non-commercial use, even if that usage takes place in a store. What is the Point of a Proxy