Maractus' "Constant Rattle" attack says what to do if you flip 1, 2, or all heads, but what happens if you flip no heads?
If you flip no heads, the attack does nothing.
Source: Black & White FAQ (2011-04-28), PUI Rules Team (2011-04-28)

Relevant cards

Note: All applicable cards may not be listed below.
BW1_12