Hex drinker seems terrible in burn. No haste and you're incentivised to put Mana into it instead of playing your burn spells
Well, being mana intensive doesn't autoexclude it in aggro decks. Grim Lavamancer is mana intensive. Figure of destiny is similar and it was even played in Legacy Burn when there weren't better 1 drops. In the worst case it's a Jackal Pup that could help against flooded situations. Creatures aren't what we usually want as topdeck, but it isn't a bad one. And it can be pump with Atarka's Command even under instant protection. I don't know if it's worth or not, but I find it interesting enough for testing.
I agree that Sunbaked Canyon is very interesting. Now with it, I guess that the right number is 20 lands with 1-3 Sunbaked Canyon. If Nimble Mongoose gets popular, Relic of Progenitus will probably be the best grave hate card, and I would also consider black versions with Self-Inflicted Wound.
Well, being mana intensive doesn't autoexclude it in aggro decks. Grim Lavamancer is mana intensive. Figure of destiny is similar and it was even played in Legacy Burn when there weren't better 1 drops. In the worst case it's a Jackal Pup that could help against flooded situations. Creatures aren't what we usually want as topdeck, but it isn't a bad one. And it can be pump with Atarka's Command even under instant protection. I don't know if it's worth or not, but I find it interesting enough for testing.
https://www.mtggoldfish.com/deck/1986223#paper