Split second (As long as this spell is on the stack, players can’t cast spells or activate abilities that aren’t mana abilities.)
Exile target creature. Exile Perfect Crime No traces, no witness, no culprits.
I really like O-Naginata, great vs decks who can chump block Kor Duelist again and again to gain time. Steelshaper's Gift makes the deck a bit slower but having the option to choose what I need to the board is great, otherwise I simply search for Bone-Saw/Splitter.
Lone Rider is another card that I'm testing, it help me with lifegain and if I'm able to flip it becomes quite brutal.
My sideboard choices are debatable, and budget/local-meta based.