Monoist Circuit-Feeder

The enters trigger reads like two effects but resolves as one swing: it moves X points onto a creature you control and pulls X off a creature your opponent controls, where X counts every artifact in play under you (including this Nautilus itself, since it enters as an artifact creature). The design puts a floor under the payoff and no ceiling. As long as there's an opposing creature to point the debuff at, it enters with at least one artifact to its name, so the trigger always does something; in a deck that leans into artifact density it becomes a combat-warping tempo swing, simultaneously turning one of your bodies into a threat that trades up and shrinking a blocker or attacker out of the way. The split-target structure is the wrinkle worth dwelling on: the +X/+0 and the -0/-X do not have to point at the same fight, so you can pump an attacker while quietly killing a small utility creature elsewhere, or shave a would-be blocker's toughness to force a bad trade. The flying 4/4 body is not the reason to run it; it is the delivery vehicle, an evasive attacker that carries its own end-of-turn power boost the turn it lands. What makes the effect scale is the artifact count, which ties the card's ceiling to a board state you were already building toward rather than to raw mana investment.