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
In addition, there's also a small foldout card with a brief summary of the rules
Sigarda, Champion of Light is an excellent human lord that can give you more humans when it attacks, while Sigarda, Heron's Grace gives your humans hexproof
Even static lock effects can draw widespread applause for interesting gameplay, when theyre of the softer, taxing variety, a la Thalia, Guardian of Thraben or Kambal, Consul of Allocation
Heres a bottom-up example: I have this Sefris of the Hidden Ways precon deck
Math Skills: Count damage, energy needs, and effects, enhancing your math prowess while having a blast