Mana Flare

Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

Heartbeat of Spring

Vigilance
A player losing unspent mana causes that player to lose that much life.
{1}, {T}: Each player adds {B}{R}{G}.

Whenever a player taps a land for mana, that player adds one mana of any type that land produced, and this enchantment deals 1 damage to the player.

Flash
Whenever a player taps a land for mana, that player adds one mana of any type that land produced.

At the beginning of each player's first main phase, that player adds {G}{G}.