Heartbeat of Spring 
Enchantment
Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
Legality
standardNOT LEGALpioneerNOT LEGALmodernLEGALlegacyLEGALvintageLEGALcommanderLEGAL
Enchantment
Whenever a player taps a land for mana, that player adds one mana of any type that land produced.