The way to win against people massing giants is to defeat their army first, when they have not build giants, just like when you fight a normal player, after you found out that he is massing giants, use speartons as meat shield and use shadowraths to do massive damage to the giants and poison them by using shinobi, cloak or stealth.Use merics to heal your meat shields and use magikill to support your army. Use albowtross to deal damage with the blazing bolts with archidons using fire arrows, at last, train giants too as massive meat shield. I always use this strategy against people who mass giants: 1 giant or more, 3 merics or more, 1 to 2 magikill with all the spells and of course 5 or more speartons as meat shield(but they all die at most time...). The another strategy is train 1 giant or more, albowtross 4 or 5, 3 merics plus 1 magikill.