mtg tarkir commander deck Tarkir: Dragonstorm Mardu Surge Magic: The Gathering Tarkir Dragonstorm

Its difficult to identify just one thing

This creature is a good backup card draw resource to have in your Azorius decks if youre still waiting on your card draw beasts like Blue Sun's Zenith and Rhystic Study

I stuck it in Tempest

Each one has a strong questing value that forces opponents to challenge or risk falling behind, and then once challenged and/or banished, their effects activate drawing you cards, forcing opponents to discard or return a character to their hand, and more

I'm actually kind of partial to this one, from Throne of Eldraine : This card sees relatively little play in Standard, somewhat outshone by Glass Casket