Dream Recycler

{2}{t}: Tap target creature you control. Add mana
to your mana pool equal to its power. This mana
may be of any combination of colors in that
creature's casting cost. Put a decay counter on
Dream Recycler.
At the end of your turn, Dream Recycler deals an
amount of damage to you equal to the number of
decay counters on it.
Exotic arcane technology cannot always be made safe.