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You can easily throw on 5 to 8 counters in a couple of turns in a four-player game, and the more people you add, the faster the Regent will stock up

It's not hard to have more artifacts you're willing to tap to outweigh the one mana to tap it (see: Treasures)

Interrogate Them Exile the top three cards of target opponent's library

It was played everywhere, and since it was colorless unlike Akroma, it was played in more decks, and the was the target of Tinkers everywhere

Arcanist is happy to serve that up in the form of Surgical Extraction

In a deck that can investigate during your own turn and your opponents turns, that adds up incredibly quickly