Forum:Legendary fiend

So I am a little confused about the effect of the monster card Legendary Fiend, on the card it states that during your standby phase it gains 700 atk. So my question is as follows is the 700 a permanent gain and he keeps gaining 700 every turn or is the 700 gain only until your end phase? Darkruler21 (talk • contribs) 06:08, May 22, 2018 (UTC)