Julien, The Soulless

Haste, First Strike, Fragile
Whenever an opponents creature dies, Julien the Soulless creates a Fragment of Soul token. Fragments of Souls can only exist if Julien the Soulless is on the battlefield.
Each time a creature that you control dies, Julien becomes tilted.
If Julien is tilted, he is unblockable until end of turn.
(Fragile : If this creature attacks two times in a row, sacrifice this creature)