- If I have two Magnezones in play with the "Dual Brains" Ability, does that mean I can play 4 Supporters during my turn?
- No, you cannot. Dual Brains says you may play 2 Supporters, period; it doesn't say "an extra supporter" for each Magnezone.
Source:
Plasma Storm FAQ (2013-02-07), TPCi Rules Team (2013-02-07)