Nathanias, People's Champion vs Death Trap

[dejvo]

Opponent has Death Trap and I summon Nathanias, People's Champion Nathanias dies, I draw a card, which is an ally but can not cast it. Is this right ruling? Does he have to be alive to be able to cast ally which I drew?

[Gondorian]

Hi. Since he's no longer on the field, he can't grant that ongoing beneficial effect. At least he managed to draw you a card before he died (due to SRO)!