Mana Reactor

Cumulative upkeep-Pay 2 life. (At the
beginning of your upkeep, put an age counter
on this permanent, then pay its upkeep cost
for each age counter on it. If you don't,
sacrifice it.)
Activated abilities of permanents you control
cost {1} less to activate for each age counter on
Mana Reactor. This effect can't reduce cost to
less than zero.