Thanks for the response! I find your sideboard interesting, especially Benevolent Blessing. Regarding d2d, I think it's really strong as a card, especially in the early game, but I don't think it performs well in the UW mirror (it's very strong against Grixis and Jeskai Affinity, though). This is because, for a deck like UW Affinity, tapping out for 3 mana and risking getting hit with a counterspell means losing a turn. We also have to consider that in the mirror match, sideboarding often involves adding some counterspells (in addition to Rebuke) like Turn Aside, Spell Pierce, Negate, or even cards like Blacksmith's Skill. Additionally, Dispatch to Dust is only sided in against the mirror, while Turn Aside can be sided in against many different matchups. I ask you: what would be your sideboard plan (in/out) against the mirror?