In Infinity format, three decks have consistently posted the strongest results through the Wilds Unknown season: Amber/Steel Steelsong (19% meta share) is the most played competitive deck
The set is most significant for Commander Cubes, whereas I gave myself a free pass not to read any Background cards while poring over the set for Cubes broadly
So many of the cards in the deck put +1/+1 counters on your creatures for minimal effort, and with certain other cards, those counters can stick around even if the creatures with them get removed
That gets you 24 ready-to-mix Jumpstart boosters, with every pack including 20 cards, all the lands needed to play, and at least one Rare or Mythic Rare card
Older cards that had this ability received an errata to give them flash after this
He may also have some other applications in a creature-heavy Gruul deck that wants an option to go late against Jund