Glacial Barricade

Creatures can't attack you or a planeswalker you control unless their controller pays {x} for each
of those creatures, where X is the number of
Elemental permanents you control.
________________________________________
"You think that all the elements are your allies, and
yet you don't respect one element--ice. That will be
your downfall, for all I care." ~Demetrius, to Aggrol