Adam plays Emrakul, the Promised End targeting Ben with the cast trigger. On Ben's turn, Ben (controlled by Adam) cast Time Warp targeting Adam.

Question is, which extra turn happens first? Was the extra turn of Emrakul created when the trigger resolved, or at the end step of Ben's turn?


500.7. Some effects can give a player extra turns. They do this by adding the turns directly after the
specified turn. If a player is given multiple extra turns, the extra turns are added one at a time. If
multiple players are given extra turns, the extra turns are added one at a time, in APNAP order (see
rule 101.4). The most recently created turn will be taken first.