Ghostly Prison
From Tarkir: Dragonstorm Commander set
Ghostly Prison
Enchantment
Creatures can't attack you unless their controller pays
for each creature they control that's attacking you.
Rulings
- Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.
- In the Two-Headed Giant format, you still only have to pay once per creature.