This has a very good baseline and it's not that challenging to transform in the late game, and when it does it can chip in for a ton of damage
So, you can have one copy of Thalia, Guardian of Thraben on the battlefield, but you cannot have two copies of Thalia, Guardian of Thraben
Happy Friday MTG peeps, Meterologically speaking, it's been relatively mild so far but things have quite decidedly become cold 'n' crisp heralding the oncoming Winter (insert GoT quip here)
Whenever it attacks, you'll exile the top card of each player's library, and you can play any number of the cards for free
The idea that a creature you control can essentially erupt into a much more terrible Eldrazi beast is, for all intents and purposes, the coolest thing ever
However, The Death of Gwen Stacy could see play in a deck looking for diverse disruption tools