Forum:Can Phantom of Chaos copy Yubel - Terror Incarnates effect which applies "during" the end phase.

Yubel - Terror Incarnate: This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except with the effect of "Yubel". This card cannot be destroyed by battle. All Battle Damage you take from a battle involving this card becomes 0. If this face-up Attack Position card is attacked by your opponent's monster, inflict damage to your opponent's Life Points equal to the ATK of the attacking monster. During your End Phase, destroy all other monsters on the field. If this card is removed from the field, you can Special Summon 1 "Yubel - The Ultimate Nightmare" from your hand, Deck or Graveyard.

Phantom of Chaos: Any Battle Damage this monster inflicts to your opponent becomes 0. Once per turn, you can remove from play 1 Effect Monster in your Graveyard. Until the End Phase, this card's name is treated as that monster's name, and it gains that monster's effect(s) and ATK.

Since Yubel - Terror Incarnate's effect states that it activates "during" the end phase, Phantom of Chaos should not be able to copy this effect, because his effect is no longer applied "during" the end phase, since his effect states "until" the end phase. In fact there are three terms "Until" the end phase, "During" the end phase, and "After" the end phase. May I please get an official ruling to this inquiry?