I myself found the Temur Draw-Two archetype to be incredibly competitive pre-rotation with Teferi topping the curve
You can obtain the Lucario ex (2-Star Shiny rarity) card by opening Shining Revelry from Shining Revelry set
The best one by far, however, is certainly Defiler of Vigor
Hell, take their Fatal Push and kill their Glint-Sleeve Siphoner
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In fact, it's worth almost three times what Sylveon ex (the second most valuable card in the set) is worth, with a market price of $1,504