After exploring this island, place a treasure coin from your collection with value equal to or less than one you took on the island.
The way it’s written, Mysterious Island #7 would allow you to replace a coin with a UT (likely worth 0 gold). I’d imagine that’s not the intent, but the 0’s from the last sets would provide a good counterpoint to that.
Can great turtles be moved 5S in a turn by a single set of native canoes?