The most relevant thing about this ability is the condition you need to meet to transform him: when his ability resolves for the fourth time on the same turn, he'll transform
There's probably an argument that Mardu Humans should slot into the number-two slot ahead of Jeskai Cycling (which is highlighted by The Locust God and Niv-Mizzet, the Firemind), but the fact that The Locust God costs about $10 while Alesha, Who Smiles at death is less than $1 after a bunch of reprintings keeps Jeskai Cycling ahead, but just barely
Instead, it uses a restricted list, letting you use just one copy of the most powerful cards in your deck
Slumbering DragonSlumbering Dragon (4,812 Inclusions, 0% of 2,677,265 Decks) Slumbering DragonSlumbering Dragon is one of my favorite designs, ever
Super-Trample The only thing worse than trample