pokemon tcg card rarity Pokémon Pocket explained List of Four-Diamond Rarity Cards
Description
This trigger can be used to tap down scary would-be attackers, remove blockers, or even slow down an opponents board progression by tying up a big mana rock, like Thran Dynamo

(Note that if you haven't committed to drafting green-blue mill-yourself yet, then by all means take Claustrophobia early

There are artifacts that do both - Aetherflux Reservoir, and the upcoming Black Mage's Staff - but Artificer's Intuition can't find either of them

Its one of the aspects of the Masters 25 series that was done right, actually reducing classic cards to simple clean designs (except for Murder, weirdly)