Quote from peteroupc »
Scenario 2: You are correct in the sense that since Path to Exile removed the target from the battlefield, the Kiki-Jiki ability has no more legal targets and so will fail to resolve, meaning a token that's a copy of Worldspine Wurm won't be created (C.R. 608.2b).
Quote from Kumlekar »Be careful with kiki if you think they have a crackling doom in hand. They can respond to the kiki activation with it to ruin your day. Kikki does provide some nice coverage if you don't get greedy though.