With one exception, they have all been reskins of existing cards with new art, as opposed to cards that are mechanically unique in any way
Nissa, Vastwood Seer is great for having a ramp card that's good on turn 3 and 7, as well as being one of the most fair walkers on her backside, avoiding token spam while still doing something useful but not overbearing
Mega Gardevoir ex Special Illustration Rare, 178/132 In my humble opinion, this Mega Gardevoir ex is the most beautiful card in the Mega Evolution set
Devilish Valet can pretty easily one-shot kill an opponent with a single casting of Prossh and its six (at least) Kobold tokens doubling the Devils power seven times from 1 to 2 to 4 to 8 to 16 to 32 to 64, with trample to push through blockers
Best known as the Final Fantasy franchises original character designer, Amanos contribution to the War of the Spark expansion is the above portrait of necromancer Liliana Vess
This time the price of card did drop