Even though Grixis Control is the most obvious home for Nicol Bolas, God-Pharaoh, I think the card is good enough to play elsewhere, as evidenced by my Temur-based Five-Color Planeswalkers deck from last weekend
They'll still get the monarchy from you, which is sad, but you won't take any damage
Meanwhile, Garland, Knight of Cornelia is much better, and a stronger reason to be this deck
Due to this, it feels like demand for Agent Frank Horrigan isnt going to last, unless he does appear in the show
This is why I suggest Guild Artisan as a possible pairing: it can give you up to four treasures a turn when Karlach attacks, which will let you power out some truly terrifying monsters
Your characters often gain the ability to summon powerful allies to assist them temporarily in battle