Rognvaldr

Vigilance, indestructible
At the end of each end step, you may put a quest counter on Rognvaldr.
{w}{w}{w}{w}: Create X 4/4 white angel creature
tokens with flying and vigilance, where X is the
number of quest counters on Rognvaldr.
Activate this ability only on February 15.
A viking god does not simply turn 40 without
a celebration.