End Phase
Order of a Turn:
Once Main Phase 2 (or Main Phase 1 if no Battle Phase was conducted) has been completed,the player proceeds to the End Phase. Any card effects that resolve in this Phase now take effect, such as "Change of Heart" or "Brain Control". The Turn Player gets to decide in which order any effect resolves. In addition, the Turn Player may also have to pay maintenance costs for cards such as "Clear World."
If the Turn Player has seven or more cards in his hand at this time, he/she must discard to the Graveyard cards until they have only six cards in their hand. This action is the very last thing to happen in any End Phase.
If an action is to be taken "at the end of the End Phase", such as the wear-off of the temporary 3000 ATK boost of "Theinen the Great Sphinx", it is, predictably, the very last thing to happen in this Phase before the Hand Limit Discard occurs.
Trivia: The End Phase is the only phase that cannot be skipped by a card effect, unless the entire turn gets skipped.
In more detail:
(Sub-step 1) The turn player (TP) may choose to activate a card/effect (mandatory, optional, or any Spell Speed 2 or higher effect), or pass. If the TP activates/resolves any effect, then after the effect resolves and after priority, start the process again at Step 1. If the TP passes, move on to Step 2.
(Sub-step 2) The non-turn player (NTP) may choose to activate a card/effect (mandatory, optional, or any Spell Speed 2 or higher effect), or pass. If the NTP activates/resolves any effect, then after the effect resolves and after priority, start the process again at Step 1. If the NTP passes, move on to Step 3
(Sub-step 3) If the TP doesn't have any mandatory effects, move on to Step 4. Otherwise: •As Step 1, but the TP cannot pass. He MUST activate an effect (mandatory, optional, or any Spell Speed 2 or higher effect). After the effect resolves, start the process again at Step 1.
(Sub-step 4) If the NTP doesn't have any mandatory effects, move on to Step 5. Otherwise: •As Step 2, but the NTP cannot pass. He MUST activate an effect (mandatory, optional, or any Spell Speed 2 or higher effect). After the effect resolves, start the process again at Step 1.
(Sub-step 5) The End Phase ends. Turn Player discards through "Hand Size Limit". Start your opponent's next turn.
