This is the Hotform Dragon Mage Deck Nov 16 he was playing on ladder climbing to legend.
I’ve started playing it myself to finish off my climb to legend, it’s really fun and actually a solid choice in the current META. Netherspite Historian is a lot more effective than it gets credit for, if you draw it on curve you have a decent body that trades with low health aggro units and you can choose a dragon to fill out your curve.
Mulligan for your 1-drops and aim to curve out. Sometimes it makes sense to keep Twilight Guardian vs aggressive decks, especially if you’re on the coin.