Adric, Mathematical Genius

The activated-and-triggered-ability copier is a narrow lever, but the tap ability here treats the whole category as a resource: any activated or triggered ability you control that uses the stack can be doubled, from a Planeswalker's loyalty activation to a landfall trigger to another creature's tap effect. That breadth is the point, though it stops at the stack's edge: mana abilities resolve without going on the stack, so they slip past this entirely. Copying an activated or triggered ability sidesteps the usual spell-copy tools that only see instants and sorceries, so the ability catches a payoff those effects structurally cannot reach. The tension is that the same permanent has to survive to tap again, and a 1/1 body invites removal the moment the loop becomes obvious; the Ultimate Sacrifice line answers that impending demise by cashing the creature in for a counter on a target activated or triggered ability, the mirror of what the tap ability produces. Doubling abilities and negating them are two sides of the same stack-manipulation identity, and folding both onto one artificer makes the card a control valve rather than just an engine piece. The Doctor's companion keyword frames it as half of a partnership rather than a solo commander, which shapes what it can plausibly build around: it wants a deck already generating abilities worth copying, not a shell constructed to protect a fragile enabler. It reads as a technician's tool, doing precise work on the parts of the stack most copy effects ignore.