Then it is probably their quest to use it. If you are lucky your opponent will use a lot of magic monsters. With life splinter, you can counter it like crazy. Look here:
I used Lord Arianthus in the front. He reduces all damage to him and counters every magic attack. So this is what a tank looks like against a magic-based team. One of my team members was now mushroom seer. With that card, you reduce all enemy magic attacks by 1 damage. Your tank will take now like no damage but will counter every attack. This strategy needs a bit of luck because your opponent has to play magic monsters but if they do, it is a safe win.