Siege of Fire and Steel

Equipment's you control have "equip to red
creature: {0}." If your opponent controls a war enchantment, You gain protection from
your choice of white or blue.
{x}{t}: X creatures you control gain a
Double Strike counter. You may only use
mountains to activate this ability.
"...the dwarves came, axes red hot, and the dragons
shot the gryphon's out of the sky..."
-A madman's account of the Peak and Valley War