From M:TG Archive, a library of Magic: The Gathering information

White is the color of life, order, law, righteousness, and light (although not necessarily "good.") Typical white creatures include knights, soldiers, and angels. Within the game, white's strengths lie in healing damage; launching tactical creature assaults; removing opposing enchantments; and imposing additional rules that all players must abide by. White's weaknesses include its difficulty in answering threats through direct removal, and the fact that many of its most powerful spells affect all players equally.