Aggression is quite flavourful, showing that barbarian lady going all Leeeeroy Jenkins into the castle
In theory, there could be decks that don't want Glasspool Mimic (ones that have almost no creatures), but even with just a handful of creatures worth copying in your deck, it's significantly better than the Island it will likely replace
Thats all Ive got for today, but I will be back later this week, focused on the new decks that are going to exist in Standard on Ixalan releases
Pain Seer
I remember looking at my mom and saying if I pull a holographic Charizard I am going to freak out. Literally, the first card out of the first pack was that card, I started screaming with joy in the parking lot
The only problem is, youd better cast it, because you can do better than cast a 9/9 trample