Forum:Maticore of Darkness and Card of safe return

Manticore of Darkness' effect allows you to Tribute a monster from the hand or field in order to special summon Manticore of Darkness from the graveyard, while Card of Safe Return allows a duelist to draw a card each time a monster is special summoned from the graveyard. Repeat the process as much as you want to draw as many cards as you want.

I just read this tip and was curious. If you draw as many cards as you want during your end phase don't you have to still discard your cards until you have six cards left in your hand? But if you do it during your opponent's end phase then you can have as many cards in your hand as you want because you have to discard cards only during your end phase right? Can someone just help me clarify? thanks