To Filter Item Base Types, you need to create one rule for one type of item.
For your example, to filter Wand, you need to create a rule with the Condition → Item Type → Type: Wand and THEN the subtypes selection becoems available.
If you select multiple Types, subtype selection get’s greyed out.
https://imgur.com/W85Rfxz
https://imgur.com/ZSKqFuW
Now you need to decide how to use this kowledge.
You can either createa Hide Rule at the very top hiding all the undesired base types (that’s how I do it)
Or you can create a show/recolor rule showing/recoloing all the base types you are interested in.
In case you are interested in learning more about the Loot Filter I do have 2 ressources here:
Maybe you can learn a thing or two from inspecting my generic class filters, they are not very specific, but you can see some methods I am using there.
The Guide is outdated, but still valid, it only misses the new functionality that recently got added to use multiple affixes in rules.
That actually does exist, but the problem in LE is, that the level requirement of an item is not indicitive of it’s power.