"How have I angered nature that she would imprison me in a labyrinth of grass?"
—Kasib ibn Naji, Letters

Elephant Grass

Cumulative upkeep {1} (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay its upkeep cost for each age counter on it.)
Black creatures can't attack you.
Nonblack creatures can't attack you unless their controller pays {2} for each creature they control that's attacking you.

The List

Visions

Cumulative upkeep o1
Black creatures cannot attack you. Nonblack creatures cannot attack you unless their controller pays an additional o2 for each attacking creature.

Unless some effect explicitly says otherwise, a creature that can’t attack you can still attack a planeswalker you control.