
Creatures can't attack you unless their controller pays for each creature they control that's attacking you.
"That's the third time! And it wasn't funny the first two times either, Jim."
Illustrated by Irina Nordsol · Secret Lair Drop · #7042
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.