Ice Beast Zerofyne VS Divine Dragon Knight Felgrand

If player A controls Divine Dragon Knight Felgrand and no other face-up cards on his side of the field and that Divine Dragon Knight Felgrand has used its effect on itself, meaning that it is unaffected by other cards' effects and its effect is negated, player B cannot activate Ice Beast Zerofyne's effect.

Ice Beast Zerofyne needs to be able to negate at least 1 card on the opponent's side of the field to be activated.
Also, it must actually end up negating at least 1 card in order for its bonus ATK to happen.