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Focus on Reshiram and the rare card N's Reshiram (revealed at the World Championships)

owyn, Fearless Knight Haste lets owyn, Fearless Knight make an immediate impact even after the enters ability exiles a larger opposing creature

That said, when considering in-person (IRL) events, Id probably stick with Broodscale Combo

There are decks that maximize the amount of pips in their spell costs, like Linden, the Steadfast Queen

Watching a large number of videos and noting down the hits or rare cards in general is a good way to figure out approximate rarities - mainly for categories of cards, but with enough data you can infer some information about individual card rarities, though it is not always easy to tell if the information is statistically relevant or not