Oracle's Vault

The brick counter is the clever bit of pacing here: the card forces you to pay the toll three times before it ever flips into the free mode. The first ability is impulse draw with a tax (two mana plus the tap, and you must use the exiled card that turn or lose it), but every activation ratchets toward the second, where the same exile-and-play happens for free, mana cost waived entirely. That conversion from "rummaging for value" to "casting your bombs off the top" is the whole arc of the artifact, and it rewards a deck top-heavy enough that a free random spell each turn actually swings games. The catch is the randomness on both halves: you exile blind, and whatever comes up has to be playable on the spot, so it punishes cards that want to wait and favors permanents and instants that drop the moment they appear. Building counters costs time and mana you might rather spend elsewhere, which is the friction that pays for an effect that, once online, is a recurring no-cost spell every turn. It sits with the card-advantage artifacts that demand setup before they pay out, closer to a slow engine than a burst of velocity, and its whole strategic identity is the wager that you will still be alive when the third counter lands.