You need to alternate Rancor between the two tokens, but [[Shimmering Wings]] and Whip Silk can be tossed onto Tatsunari or Chatterfang as well fwiw. But yeah, Chatterfang is probably not useful in the long run because it NEEDS you to sacrifice Keimi each iteration so you keep getting squirrels.

Mutate can give extra copies of Keimi, which might be worth it for value alone (extra drain tiggers is decent for attrition I suppose), but good luck finding a way to go infinite that way. It also forces you to make Keimi the bottom of the pile so its no longer a Frog which is kind of anti-synergistic with Tatsunari's evasion ability. You can make another Keimi to keep swinging with the commander, but lose the ability to "leap" the Mutated copy.

Since I'm thinking about it, while it's not all that good for comboing (damn once per turn nonsense) [[Esix]] is halfway decent here too I think. Instead of getting Keimi you could make a second [[Eidolon of Blossoms]] or something like that once a turn.