tcg one piece booster box Amazon.com: BANDAI NAMCO Entertainment Trading Card Game Awakening of the New Era OP-05 [ENGLISH, 24 Packs] : Toys & Games Includes special DON One Piece TCG: The Azure

Proliferate is a keyword action that lets you choose any number of players or permanents and put an extra counter on them for each type of counter already there

This deck archetype struggles against fast and powerful combo decks, which is why you wont see it played a lot in Legacy and Modern

Remember just casting Herald of Torment

You either create cards that just objectively suck (i.e.: most of this list), or you risk making an actual good leyline that breaks the game by nature of how these cards work

Or this could be a top tier aggressive common, especially when backed up by cards like Battlefield Promotion

These are the cards that don't otherwise have a Booster Fun variant in the main set (i.e., cards that can be found in Draft or Set Boosters)