Rune Axe of Grimnir

Equipped creature has unblockable and
double strike.
Whenever equipped creature attacks,
double its power until end of turn.
Equip {6}
The mighty axe wielded by the White Dwarf answers
the description of the Rune Axe of Grimnir, mentioned
in several sagas and legends. Perhaps Grimnir gave
the legendary weapon to the White Dwarf?