Maybe your opponent casts the Coil and Catch half of a Marang River RegentMarang River Regent youre going to spend the rest of the game braced for the Dragons arrival
Like most other things in the game, a triggered ability will put the trigger on the stack (where spells and abilities go before they're resolved and become part of the game), and it must be resolved in the same way casting a spell would be
Mistrise Village and Dalkovan Encampment are the clear frontrunners as far as Im concerned, though I can see arguments for the rest
It doesn't have warp itself, but references warped creatures you own in exile that's to say, cards that you cast for their warp costs, and then exiled during your end step
Krark, the Thumbless I've been burned before by coin flipping in Pokmon, but you got to love not requiring any extra cost to flip the coin with this commander