Gold sets in general have power thats usually concentrated in tri-color rares and mythics, so this time, the best cards will be concentrated on the higher rarities a bit more
Reaper of the Wilds does a bit of everything, it can trade up well, it can be fat for cheap and dominate the midgame
Jace Beleren With Jace Beleren you get a Howling Mine when you want it, the ability to make an individual player draw a card, or an ultimate that mills 20 cards from target player
For me, its my Laelia, the Blade Reforged deck
You get a free 4/3 haste from the yard when you cast your second creature spell of the turn
Voice of Resurgence enabled green-white midrange decks during its time in Standard, as it's a creature that discourages both killing it and even casting a spell on the Voice owner's turn