Hydroreservoir Maximus

{t}: Place token on Hydroreservoir Maximus
Remove a token: Add {u} to your mana pool.
Sacrifice Hydroreservoir Maximus: All non-flying creatures take 4 damage and are tapped and do not untap on the controller's next turn.
"Water is patient. Water is brutal. It is hubris to believe otherwise." - Archmage Etheram