After sideboarding, you can change what the game is about, abandoning your low-impact creatures that would get caught in sweepers and instead presenting a midrange deck similar to theirs, but with counters and Eldrazi, and surprise them with a plan of going over the top of them without overcommitting to the battlefield
Madam Mim Snake makes your exert and Rush characters more valuable, and Madam Mim Fox does the same with added Rush
1 Thassa, Deep-Dwelling Finally, we're back to Theros for the god of the sea, Thassa
Amulet of Quoz was one of the last ante cards produced for the game, which had gotten away from playing games for ante
You can run a 60 card mill deck and look to shuffle a few Puas back into your deck during the game to ensure you never deck out before your opponent