Rhaast, Scythe Unleashed

Indestructible, Encumber, Remembrance
{2}{b}{r}: Rhaast, Scythe Unleashed become unblockable until end of turn
When Rhaast, Scythe Unleashed leaves the battlefield, return Kayn, Shadow Reaper
from exile to the battlefield tapped.
Now I own the shadows. I will unleash them
upon this wretched place!