Mana Flare

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

Zhur-Taa Ancient

This spell can't be countered.
Destroy target nonland permanent with mana value 3 or less.

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

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

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