Im really P*ssed. ( A little )

I Play a Dimir Deck with Marinas Grimoir, so im drafting alot of cards. And i happen to play against a guy whos name is Jester of Jihad ( funny name) . And what this guy did was getting storm with his Plainswalker and then give me a rhysitc study, but not one he gave me 11.

So it happens that i drew 40 cards in myhand, all fun and jokes but when i had no cards left i just died.

And i ask why i die if i have the grimoir on my board which prevents all dmg and only looses if i have no cards?

This was the situation i was in, i thought im fine but apperently i still die even if i have 40 cards in hand.

think unfair?