Although he ran some of the standard choices such as Evenly Matched for going second and Solemn Scolding for going first, he interestingly ran Secret Village of the Spellcasters
choose 1 "Sylvan" card from your Deck and place it on top of the Deck
Bubble Snare, Capture Sphere, Castaways Despair, Charmed Sleep, Claustrophobia, and others usually cost three or four mana, and tap down a creature and keep it tapped down
So many, in fact, that people complained, and Konami banned Baronne de Fleur in the TCG format
This is also how you get access to the Mega and Mega+ Difficulties of the game
(2/9/2017) If you control no creatures with power greater than 0 as Rishkar's Expertise resolves, you draw no cards, but you may cast a card with mana value 5 or less from your hand without paying its mana cost