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Chain of Vapor Fairly common in cEDH as one of the quickest ways to bounce a nonland permanent (including artifacts and enchantments), Chain of Vapor can also start a bit of a political chain reaction if your opponent decides to copy it and either return the favor or pay it forward

Most people will only notice them when it's too late

If another effect (or effects) modifies how much damage a source would deal to the chosen player or a permanent they control (for example, by preventing some of that damage), the player being dealt damage or the controller of the permanent being dealt damage chooses the order in which any such effects, including the effect of Sawhorn Nemesis, apply

Whether you like it or not, topdecks in Magic exist, and your opponent plays those cards specifically to draw them