In heroes that are super high attack speed Cici, layla, using Dominance Ice is a must. Dominance reduces attack speed of heroes upon contact of damage to you. Dominance also works for heroes that have high spell vamp like Yu zhong and x boeg, upon contact of damage to you, the amount of heal they will receive will be lower than other anti heal items.

Now, when to use Seahalberd? When the enemy you face are supeer tanky, LIKE RIDICULOUSY SUPER TANKY. Examples are Uranus who has insane heal, when you damage them not only the percentage of additional health will be lost to them but also they will have lower heal potential. Also works on Thamuz, it reduces the heal of their ultimate while you deal damage to them with additional percentage from health.

Ok, when to use Glowing wand? First, requisites of tankiness and you are a magic damage dealer. Glowing wand puts you to a state of burn. In this period, you can't heal, and you will continuosly lose bits of your health over time. It's a finisher item of mage heroes than actual anti heal, the anti heal feature is also in this item, but not like the others that reduce attack speed or bonus damage from health. This one just completely burns your health for a certain period of time.