It has a nice trigger, though its one that doesnt look great on such an expensive creature
Of course, building your deck with the only creatures being one Street Wraith and two Emrakul, the Aeons Torns is a big cost, and you'll have to play a bunch of ways to tutor up your one Street Wraith for the plan to work, but this plan is actually very similar to that of various Possibility Storm and Polymorph decks, which go to great lengths to ensure their seemingly random payoff is anything but
I like that it modifies creatures for its card draw
It also gets +1/+0 until end of turn if you control a Mouse
Amethyst cards are more focused on magical themes, with perks like drawing extra cards or even returning banished cards to a player's hand through resurrection spells
Decks with Snapcaster Mage need to be particularly aware of this decision, because Snappy extends your Burn's reach well beyond what an Abzan player might expect