Memory Erosion 
Enchantment
Whenever an opponent casts a spell, that player mills two cards.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
Whenever an opponent casts a spell, that player mills two cards.