It sees nowadays mostly play against Hammer and artifact strategies, Rhino or Construct tokens and also helps against the powerful one drops like DRC, Ragavan and Deaths Shadow
This means you can't attack or activate abilities that require tapping in the same turn that a flash creature enters the battlefield
The three most useful recent additions to equipment decks in EDH Ardenn, Koll and Reyav all share Halvars abilities between them, and redundancy is the key to any strong strategy
Shadow in the Warp discounts the first creature spell that you cast each turn and punishes opponents for casting noncreature spells
Some cards have alternate art evocative of early products, some have art that covers the whole card, and we even get land cards that look like classic module covers
I quite like this rather traditional looking Japanese promo