Heartbeat of Spring
Enchantment (CMC 3)
Whenever a player taps a land for mana, that player adds one mana of any type that land produced.
Decks with Heartbeat of Spring
[2XM] Double Masters #171 (R)
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[CHK] Champions of Kamigawa #212 (R)
[SLD] Secret Lair Drop #1010 (R)