Pulse of Llanowar 
Enchantment
If a basic land you control is tapped for mana, it produces mana of a color of your choice instead of any other type.
Legality
standardNOT LEGALpioneerNOT LEGALmodernNOT LEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
If a basic land you control is tapped for mana, it produces mana of a color of your choice instead of any other type.