When the first card they draw each turn is exiled instead of drawn, it forces them to either play it or lose it
It's attack also isn't that bad
If you scan a card at 1200dpi you will be able to see certain print patterns and will be easily able to see solid black elements that have sharp edges on a genuine card
It doesn't matter how the permanent card arrives at the graveyard, or where it comes from: Discarding, milling, surveilling, or a land being destroyed are all descend events as long as the permanent card gets to the graveyard
The cost of a fake is too high to rely on photos alone
Numot, the Devastator Numot, the Devastator made my list of Saltiest Commanders, to some rather controversially