This ingenious loop leverages Emry, Lurker of the Loch to repeatedly pull Welding Jar from your graveyard, casting it for zero mana while Concordant Crossroads ensures Emry is always ready to tap immediately without waiting for summoning sickness. Every time you cast that free artifact, Displacer Kitten's avoidance ability triggers to blink Emry, resetting its tap ability and triggering its four-card mill upon re-entry. Meanwhile, Welding Jar sits safely on the battlefield waiting to be sacrificed or recast, fueling endless artifact and creature triggers that can easily dig through your entire deck.