When this Siege enters, look at target opponent's hand
As characters in Final Fantasy frequently have multiple forms, or go through immense character development - see Terra's Trance, Bizarro Sephiroth, Cecil's whole character arc - many of them will feature as double-faced cards, with different abilities on each side
Adding red each time you cast a spell and not having that mana leave your mana pool as steps and phases end is sweet, and can lead to some really stormy lines of play
Of course, in terms of gameplay, why is this card so supremely expensive
Sacrifice outlets and repeatable egg-makers turn Atla into a reliable engine that overwhelms opponents with must-answer creatures
Sheoldred, the Apocalypse emerged as the hottest card from Dominaria United, and it lives up to its reputation as an incredible Commander