The Ur-Dragon pioneered that, and now we have Sliver Gravemother for the Fractius
Since its unbanning, new strong equipments (Kaldra Compleat, The Reality Chip, Colossus Hammer) have been printed and have found a home in a very solid Tier 1 deck (Hammer Time) alongside Stoneforge Mystic, without being too powerful for Modern
Zombies tend to outnumber other non-typal decks, which makes Ravenous Rotbelly effective at narrowing the board in certain matchups
you cant spend them on your costs
Though they tend to be a relatively cheap way of getting a bundle of three packs (cost wise, theyre generally slightly cheaper than buying three boosters separately), with no way of guaranteeing what packs are in the Pokeball tin, its a bit of a gamble compared to just buying the boosters you want
Impulse 7.5 As soon as you build a deck like this without black you start to need a tonne of cards like this to make up for the lack of tutoring