This is definitely the kind of card it is easy to miss on, because it is both unusual and utilizes a new mechanic, but I dont think Im super high on it right now +4/+0 is the kind of boost that makes almost any creature capable of attacking, but an Equip Cost of 5 is way too much
Feeding cards like Ichor Wellspring and Bounty Agent to the graveyard, then reanimating them over and over provides some excellent value in a long game
Play Boosters were a type of booster pack introduced with Murders at Karlov Manor
Darkrai VSTAR [C][C] Dark Pulse: 30+ damage
If we ever got another Team Rockets Charizard or something like that in a modern set, the outcry would be truly insane.
If you do want to use this card in a normal deck, you can pair it with Soul Release, which allows you to banish up to 5 cards in your graveyard