One of the cards from Modern Horizons 2 that caught my eye is Dragon’s Rage Channeler.
This card seems really strong! In many ways, it reminds me of Delver of Secrets and it will very likely go into the same kind of deck.
In Modern and Legacy, it should be very easy to get four different card types into your graveyard – between fetchlands like Polluted Delta, instant and sorcery speed card selection spells like Opt, Brainstorm, Ponder and Preordain, it should be fairly easy to get at least three types into the graveyard.
The rest will be the creatures themselves – both Delver of Secrets, Dragon’s Rage Channeler and perhaps even others like Dreadhorde Arcanist or Young Pyromancer seem like they would fit very well into this kind of deck.
If you want to get a little tricky, you can even add some “free” spells like Mutagenic Growth or Gut Shot to possibly grow your Dragon’s Rage Channeler at instant speed by adding the fourth card type into the graveyard.
You might be able to turn this card on even in Historic if it ever becomes legal, mostly thanks to Faithless Looting, which can get the right cards into the graveyard for just one mana. I can see this card fitting straight into Rakdos Arcanist for example, where you already mill yourself with other cards like Stitcher’s Supplier as well.
Dragon’s Rage Channeler looks like just an innocent uncommon, but I’m sure it is going to make a big splash in the older formats.