Run-Away Mana Engine

At he beginning of your upkeep put a charge
counter on Run-Away Mana Engine.
At the beginning of each player's pre combat
main phase, they add {r} to their mana pool,
equal to the number of charge counters on
Run-Away Mana Engine.
Each player loses life equal to the amount
of mana in their mana pool at the end of
steps and phases.