Muzzio, Visionary Architect

Build big, dig deep: this artificer runs on a feedback loop where the size of your board determines how far you burrow. X equals the greatest mana value among the artifacts you already control, so a single fat construct on the table converts each activation into a look at a meaningful slice of your library, and hitting a bigger artifact off the top raises the ceiling for the next activation. Start with a thin board and you are peeking at a small number; resolve a colossal artifact and you are effectively scrying through a chunk of your deck for the next bomb, dropped into play free of its cost. The 1/3 body is the brake on all this: a tap engine that wants to survive and untap across turns, not fire once, so it asks you to shield a fragile blocker rather than cast and forget. The activation carries no sorcery-speed restriction, which matters more than the wording suggests: you can leave the ability uncracked, hold up interaction, and fire it only when the mana is otherwise idle. The variance of the look is what pays for the free entry. You may put only an artifact card from among the top X onto the battlefield, and everything else buries to the bottom, so a stretch of nonartifact cards just spins the wheel with no payout. It rewards a top end stacked with artifacts and accepts that the dig is a lottery weighted by what you have already committed.