Curse of Silence 
Enchantment — Aura Curse
Enchant player
As this Aura enters, choose a card name.
Spells with the chosen name enchanted player casts cost 
more to cast.
Whenever enchanted player casts a spell with the chosen name, you may sacrifice this Aura. If you do, draw a card.
Legality
standardNOT LEGALpioneerLEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL