
Creatures can't attack you unless their controller pays for each creature they control that's attacking you.
Illustrated by Volkan Baǵa · Special Guests · #19
2014-02-01
Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.
2007-02-01
In the Two-Headed Giant format, you still only have to pay once per creature.