This is going to be your most often summoned champion, not only because of his versatility both as a support and combat unit, but because his cheap cost works great with the High Elves plan of having a lot of commons on the battlefield.
Don’t be afraid of having Albus just sitting back supporting your units where he is more comfortable. He has many situational uses, especially disabling opponent abilities during your turn, but his core use is to deactivate either the Law of Fortitude on an enemy common or Law of Atonement on one of your units. While it may not seem a great effect, the fact that you can do it every turn without really risking Albus accumulates a lot of value for a cheap cost. Albus will generally prove extremely efficient over time.