Tarmo Twin and Melira Pod have taught me that one of the best things you can do with a Modern deck is play a strong fair game of Magic while also having the potential to combo kill. Ever since Wild Nacatl was unbanned I've had Wall of Omens and Restoration Angel on my mind.
I'm a sucker for value.
From there, Kiki-Jiki, Mirror Breaker adds a combo kill with Restoration Angel. I chose blue for Snapcaster Mage as an additional creature that has synergy with Restoration Angel and Kiki-Jiki, Mirror Breaker as well as a bunch of counterspells to ruin my opponent's plans. Another way of looking at this deck is that it's just UWR control that replaces a Planeswalker and Sphinx's Revelation endgame with a Kiki/Resto combo.
Typical UWR control decks struggle with cards like Thrun, the Last Troll and Slippery Bogle, but Kiki Jiki is thoroughly unimpressed. Sideboarding against these fair decks that can combo kill tends to be more difficult than against a deck with just one plan. Do you play your interactive spells and slowly lose to my incremental value, or do you play a more proactive plan and risk just losing to my combo?