Whether you want to reuse a burn spell, shift a removal spell onto a more deserving enemy target, or double up on a loyalty activation from a planeswalker like Chandra, Torch of Defiance, it gives you options at the exact right moment
Where a classic Magic: The Gathering card has a large portion dedicated to standardized elements specifically aimed at streamlining gameplay, these cards get wild
cards, and parallel variants
1 Deck box (that can hold 100 sleeved cards)
Not only do you draw a card, but you can immediately cast a spell from your hand with mana value equal to or less than the damage dealt, without paying its cost
That makes him pretty hard to justify running more than 1 or 2 copies of in a deck, unless you have a ton of other Mickeys as targets and Bodyguards to proc the draws