The whole is greater than the sum of the parts
You can give your stuff a +1/+1 counter and flying for 0 loyalty, and then -3 to destroy a creature an opponent controls with power 3 or greater
Actually, there's no ethical or acceptable reason to make "proxies" to pass the light test, bend test, and other well-known tests to weed out fake cards because there's no ethical or acceptable use of proxies that requires the proxy to be as similar to a real card as possiblea Sharpie on a basic Island does the job just as well and without any of the legal and moral issues
For as long as Secret Lair cards remain this difficult to get ahold of, both at and after release, price spikes like Geralfs Messengers are likely to continue.
The example above uses the Vault frame from The Big Score
We are not taking a ton of extra turns, while drawing piles of cards each turn