Each time you attack you must use magic spells with the proper combination of symbols to at least match the magic indicated on the card you're attacking, in order to succeed. An attack could require 2 Conjuring, 5 of any type, or 2 Manipulation and 3 Divination, etc. (The wand symbol indicates that you can use any type of magic for the attack.) So for example, you can attack a card requiring 2 Conjuring with a spell that produces 2 Conjuring, or 3 Conjuring, or with 1 Conjuring from you and another 1 Conjuring from a fellow wizard casting a spell to assist you. You can attack 5 of any type of magic with 3 Conjuring, 1 Manipulation, 1 Divination, or with 1 Transmutation, 1 Conjuring, 1 Illusion, 1 Manipulation, and 1 Divination, or any other combination of magic from you and other wizards which combined equals 5 magic.