Entrance condition:

{
  "comeInWithSpark": {},
  "comesThroughToilet": "any"
}

Requires:

{
  "shinespark": {
    "frames": 3,
    "excessFrames": 3
  }
}

Dev note: This strat is not useful in-room, but can satisfy a strat in the room before with an exit shinespark.