I recently saw a combo using Sensei's Divining Top and an untap method to stack Top triggers, which apparently lets you draw your whole deck. Shouldn't the top triggers all disappear once you resolve the first one, since Top disappears to the top of your library?
This combo works as you describe.
Activated and triggered abilities exist on the stack independent of their sources. They’ll resolve as normal even if their source is no longer on the battlefield. If this wasn’t the case, then cards like Evolving Wilds wouldn’t work since sacrificing the source of the ability is part of its cost.
In the case of the Sensei’s Divining Top activations, each ability will resolve and do as much as it. If Top isn’t on the battlefield, then the second part of the ability can’t happen and nothing beyond a card being drawn will occur.









