Surprisingly, Ditto is the perfect companion to Koga, as they both share more similarities than they would appear to at first
I am generally a fan of Charm and Command cycles, as I think they allow for interesting gameplay, since you can change their function in the context of a given game as opposed to it being rigid in what it always does
Fire Navy Trebuchet's controller chooses which player, planeswalker, or battle the token is attacking
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Perhaps Erase is a good card against this particular mono-red deck, but that would only follow from logic along the lines of: "This matchup is very favorable for me in the absence of Outpost Siege, so it's worthwhile to sideboard a narrow answer card because it prevents one of main ways I can lose." Such specific and thoughtful analysis of the matchup is great, and it might lead you to play with one or more copies of Erase in your sideboard