Unifying Theory 
Enchantment
Whenever a player casts a spell, that player may pay 
. If the player does, they draw a card.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
Whenever a player casts a spell, that player may pay . If the player does, they draw a card.