Discard-focused decks usually feel right at home with Emerald cards, since theyre all about tossing your opponents cards into the discard pile or sometimes just rudely shoving them back into their hand
One of these types was the Arena League promo cards
As a bonus to Leatherhead, Swamp Stalker, it also has trample, meaning the chances of it dealing player damage as a 5/4 creature are already high, and that's before you put any additional counters on it.
I felt scry was a little wasted, both by being a little overcosted but also for not being on any reasonable agro or cheap creatures
Given time, they will crush you, but they can often fall behind
This piece is an abridged version of a much more detailed article that I'm taking too long to write