Living Brain, Mechanical Marvel

The animation clause does the same structural work as the old Karn, Silver Golem trick, but pointed at a narrower target and welded to a repeatable trigger. At the beginning of combat on your turn, one of your non-Equipment artifacts stands up as a 3/3 and untaps: your Signets swing, your inert artifacts become threats, your mana rocks get a second job. That untap is the quiet half of the ability and where the whole engine turns. Animating an artifact into a creature has been a staple trick for decades; making the animated thing untap first is what lets a tapped-out Sol Ring stand up and attack in the same turn it made mana. The sequencing matters, though: the untap fires before attackers are declared, so once the rock swings it stays tapped for the rest of the turn. This is a mana-then-attack line, not a have-it-both-ways one. The base 3/3 override flattens whatever the artifact already is: a tiny Mox becomes a real attacker, a large construct gets cut down to size, so the effect levels rather than buffs. What keeps it contained is the shape of the trigger itself: one artifact per combat, and only on your turn. The animation lasts until end of turn and never fires on an opponent's combat, so nothing you animate can be held back as a surprise blocker. It is an offensive drip that asks you to own an artifact worth animating, then hands your idle rocks a swing they did not have.