Emblem for Serra, the benevolent doesn't trigger, you'll still receive fatal damage even while controlling creatures. A buddy and I messed around with counters and tokens. I have Serra's emblem and platinum angel, I go down to -500 million hp despite that the emblem says it can't go below 1. If I didn't have Platinum Angel, I would have lost (which I did a bit later when he bounced my Platinum Angel since -500 million hp). This has happened before too once in an ordinary game with low damage, died to an instant card which dealt damage. I understand most players don't play this way but spending wildcards for cards that don't work doesn't sit well with me.