I'd like some feedback on an item concept, please =)

##Snide (Total Cost : 995g)

Rejuvenation Bead + Rejuvenation Bead + Dagger

• +15% Attack Speed
• Passive : Basic attacks steal 4 Health Regen per 5 seconds for 4 seconds. This effect stacks up to three times against a same target.

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(Here's an example as to what it could build into :D )

##Executioner's Calling (Total Cost : 2350g)

Snide + The Brutalizer

• +30 Attack Damage
• +20% Attack Speed
• UNIQUE Passive : +10% Cooldown Reduction.
• UNIQUE Passive - Pestilence : Basic attacks reduce the target's armor by 20 for 3 seconds and apply Grievous Wounds for half the duration.

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As you might have noticed, my style is offering a certain buff on an item for a slightly better, similar buff.
Here I offer 10 armor penetration for 20 reduced armor on-hit.
This isn't as good for Casters, but it offers utility to your team.
Also, the health regen was offered for 50% reduced healings from all sources. Seems legit.
What do you think ?