You skip 2 Draw Phases , regardless of how many copies
of Reckless Greed you use .
It works like this :
You activate Reckless Greed . You draw your two cards, you skip your
next two draw phases.
You activate another Reckless Greed. You draw your two cards, you still
only skip your NEXT TWO Draw Phases. The second copy of Reckless Greed
doesn't care that the first already has you skipping draw phases, it
just says "skip next two". It places the same condition you already had
on you from the first one.
Same happens with the third.