Probably the 1987 high echidna by raw numbers. The 1972 and 1984 low echidna are scarce but not that rare. In another thread someone said there is a 2022 low echidna which might be quite rare but not enough information yet. The other low echidnas (2008-2016) are generally easy enough to find in mint sets but I think the 2011 is quite scarce and is only found in baby sets.
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