Elder Guardian

Mining Fatigue {t} (For the next 3 turns if target creature would become untapped, it instead stays tapped)
Recharge 18-20 (At the beginning of your upkeep roll a d20. If you roll an 18, 19, or 20, you regain the use of Mining Fatigue. Alternatively, If you have waited 5 turns without regaining Mining Fatigue, you regain it.)