I like Blight Herder as a cheaper but potentially strong midgame creature that brings along an army in a can similar to powerful creatures in the past like Siege-Gang Commander and Cloudgoat Ranger
Of course, its also possible that Julian or someone else will continue to tune R/G Vengevine to the point where it becomes a Tier 1 deck in Modern
That means this will often just be trading with another two drop or, worse a 1/1 token
TCGplayer shows you prices for both normal and foil, all the conditions, and a timeline of what a cards price has been up to the last year
Be sure to run enough card draw, and try recursion like Reconstruct History, as the decks gameplan is spread amongst many card types
In the case of our Death's Shadow list, the deck is playing 43 nonlands, so we can divide 33 (the total CMC) by 43 (the number of nonlands) to find the average converted mana cost of the nonland cards in the deck