Some people think blockers are worthless for destroying shields however if you look carefully on the card "blocker" and "Can't attack(your opponent) are two diffrent effects and Can't attack dosen't show up on some blockers so you can anything with them even your opponent if it isn't on there!There is a downside however, they useually cost 3 mana but only have 1000 attack.

I hope this helped you out and even though pojo isn't looking for any new staff if something comes up I'm always open.

-Michael H.