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This was the first time a permanent other than a creature appeared on a two-in-one card

She rewards players who have completed 30 or more competitive matches with other leaders first

As long as Snow Villiers is on the battlefield (and still a creature), that ability will count Snow Villiers itself.

There are a swathe of other cards from this era too that see some more niche application use like Muddle, Pithing Needle and Glimpse the Unthinkable

It is hard to pin down a definitive list of the most valuable Pokmon cards, because of the volatile nature of a resale-based market

Seeing that we're going to be casting giant creatures, Selvala will often be able to create more mana than all of your lands in play combined