The key difference between counterfeits and proxies is that proxies are never sold as real cards, and don't claim to be genuine
Thats literally any kind of token, including treasure tokens - which are really easy to create thanks to the popularity of the mechanic, and cost nothing to sacrifice, too
Some cards have abilities that trigger whenever you roll dice or whenever you roll a certain result
If a static ability of another permanent applies only to noncreature permanents, that ability applies to a Vehicle with living metal only during your opponents' turns
In this case, its Rakdos Vengevine, which was running around all over the place last summer before being more or less replaced by the current versions of Modern Dredge
This is the cleanest way to find closers in long games