Gavel of the Righteous

Marteau des vertueux (Gavel of the Righteous) (fr)

Artifact - Equipment (CMC 2)
At the beginning of combat on your turn, put a charge counter on Gavel of the Righteous.
Equipped creature gets +1/+1 for each counter on Gavel of the Righteous.
As long as Gavel of the Righteous has four or more counters on it, equipped creature has double strike.
Equip--Pay or remove a counter from Gavel of the Righteous.