Keldon Megaliths

This land enters tapped.
{T}: Add {R}.
Hellbent — {1}{R}, {T}: This land deals 1 damage to any target. Activate only if you have no cards in hand.

Duel Decks Anthology: Jace vs. Chandra

Keldon Megaliths enters the battlefield tapped.
{T}: Add {R} to your mana pool.
Hellbent — {1}{R}, {T}: Keldon Megaliths deals 1 damage to target creature or player. Activate this ability only if you have no cards in hand.

Duel Decks: Jace vs. Chandra

Keldon Megaliths comes into play tapped.
{T}: Add {R} to your mana pool.
Hellbent {1}{R}, {T}: Keldon Megaliths deals 1 damage to target creature or player. Play this ability only if you have no cards in hand.

Future Sight

It doesn't matter how many cards you have in your hand when the ability resolves.