BR Midrange grinds through small, efficient creatures and discard, so an extra pair of Kaito, Bane of Nightmares adds resilient threats that generate card advantage. On your turn he is a hexproof creature, so Lightning Bolt can't target him then. Be careful on their turn, though: he is just a planeswalker, and Flare of Malice doesn't target, so it can force you to sacrifice him if he has the greatest mana value among your creatures and planeswalkers. Quantum Riddler is the clunkiest top-end against their cheap, low-curve plan, so it comes out. Keep Thoughtseize and Orcish Bowmasters as premium disruption and value against their graveyard synergy plan, and continue leaning on Solitude and Fatal Push to answer their cheap threats like Nethergoyf and Stitcher's Supplier.