Tempest Unleashed

Landfall - Whenever a land enters the battlefield under your control, choose one -
*Gain control of target tapped creature, it becomes a land in addition to it's other types.
*Add {g}{g}{g} to your mana pool.
*Target player loses 3 life.
*Tempest deals 3 damage to target creature or planeswalker.
*Put two +1/+1 counters on target land you control and it becomes a 0/0 Elemental with haste. It's still a land.