While the variety of items is fantastic, and that really is the main criteria here, there are a couple caveats which keep it from my top slot: The prices may not be fantastic
It might be borderline impossible to collect a single copy of every Magic: The Gathering card ever printed, much less a playset of every card, but if you've ever wanted to build out a set, like a collection of a specific set, it could be something like a challenge to collectors
the wealth of cantrips and tutors is likely to get you there, and both Tinker and Show and Tell give attainable alternate win cons
Following the Draw Phase is the Action Phase, where players can perform a variety of actions in almost any order, as many times as rules permit, before declaring an attack
Conversely, a more defensive or slow-paced deck might need more Energy to ensure you can always power up your Pokemon
This ridiculously powerful ability can accelerate you so far beyond your opponents that, short of an immediate answer, it can be near impossible to come back from