With yubel do you have to tribute a card every turn or just once

Question

my friend says during all of your end phases you must tribute a card but i think it is only during one of your end phases

Answer 1

idiot above me, you have to tribute each turn i ran a yubel deck once,

Answer 2

It is during every one of your End Phases. But usually it doesn't last longer than 1 End Phase, the controller has usually destroyed it by then.

Answer 3

You only have to tribute at the end phase of the turn he is summoned. If they meant each turn the card should have said each Turn. it said:

This card cannot be destroyed by battle. You take no Battle Damage from battles involving this card. When this face-up Attack Position card is attacked by an opponent's monster, before damage calculation inflict damage to your opponent equal to that monster's ATK. During your End Phase, Tribute 1 monster or destroy this card. When this card is destroyed, except by its own effect, you can Special Summon 1 "Yubel - Terror Incarnate" from your hand, Deck or Graveyard.