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Risona, Farewell and Satoru Umezawa each have a foil-etched variant, making your odds for a specific variant 1/204

I looked at the all, and I think I've played all but three of them at some point in time in my game playing days, as it's my 2nd favorite color combination to draft for Abedraft (a draft I have of every card ever printed save for around 15 that are too pricey to pickup)

III Until end of turn, another target creature you control gains trample and gets +X/+X, where X is the number of lands you control

Snapshot makes that concrete

They fit green ramp strategies quite nicely since you can make them as big as you want and abuse that extra mana you can produce

Of course, its the Enchanted Rare variant of Kida that sells for the highest value, currently commanding an average price of $180