Bronze Calendar 
Artifact
Spells you cast cost 
less to cast.
You must speak in a voice other than your normal voice.
When you speak in your normal voice, sacrifice this artifact.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyNOT LEGALvintageNOT LEGALcommanderNOT LEGAL