Like most Pokmon cards, the value of Machop depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Generations)
When in doubt, always check an official scan
If the target is illegal as Legions to Ashes tries to resolve, it will be removed from the stack and do nothing, even if there are tokens with that name still on the battlefield
As it turns out, for Magics design team, having a potential villain in the room also seems to make games a bit better especially in a biodome, which is what Wizards calls the environment where a release of preconstructed decks are played against one another
For starters, it's quite hard for opponents to get rid of Sensei's Divining Top once you play it, given its built-in tuck myself into the library ability