Dundoolin Weaver

• WWizards of the Coast2025-11-17
  Official Ruling
  If you don't control three or more creatures immediately after Dundoolin Weaver enters, its ability won't trigger. If you don't control three or more creatures as the ability tries to resolve, it won't resolve and none of its effects will happen. It doesn't matter if any of the creatures you control when the ability resolves are the same creatures as the ones you controlled when it triggered.

Rulings via Scryfall