Norn's Annex
Norn's Annex {3}{W/P}{W/P}
Artifact
({(w/p)</i>} can be paid with either {W} or 2 life.)

Creatures can't attack you or a planeswalker you control unless their controller pays {<i>(w/p)</i>} for each of those creatures.
Latest set: [NPH] New Phyrexia (R)