Lithoform Engine gives a mana-rich deck several ways to repeat its best effects. It can copy one of your activated or triggered abilities, copy an instant or sorcery spell you control, or copy a permanent spell you control. Each option uses a different mana payment and taps the Engine, so choosing the right moment matters.
Copying a valuable trigger can be more efficient than copying an entire spell. A strong creature-entry ability, a landfall trigger, or a planeswalker loyalty ability can become an attractive target. The original costs have already been paid, so copying an activated ability does not require paying its sacrifice or loyalty cost again. Mana abilities do not use the stack and are not available as targets this way.
The permanent option targets a spell on the stack, not a permanent already on the battlefield. Copying an artifact or creature spell creates a token permanent when the copy resolves. Legendary copies still face the legend rule, and a copied spell was not cast, so it does not generate new cast triggers simply by existing.
Untap support such as Voltaic Key can help use the Engine more than once, provided the mana is available. Without that support, it is usually one carefully selected copy per turn cycle. This is a better fit for a deck that routinely has spare mana and powerful stack effects than for a low-curve deck trying to spend every mana developing. Identify what you most want to copy before treating the Engine as a generic value artifact.






