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This creates a small shelf-ready Japanese Pikachu group

Taking his lands is definitely a possibility, but the Orchard/Stone guarantees you'll have your opponent's colours on hand (and will more often than not give you a colour you can use anyway since you're running three colours!) The last wicked piece of tech I had success with was Jester's Mask/Head Games

You still can't include cards in your deck that fall outside of your commander's color identity, so anything that says add [color outside your color identity] in its rules text is out

Harpies run Icarus Attack because its good and it threatens your opponent out of committing too much to the field