How does this rate as a cleric domain?(From Dark Sun)

[CyberThread]

Dark Sun Domain: Soul Slayer

Weapon: Dagger Whip

Granted Power: Whenever you successfully strike
with a whip, you can automatically attempt to grapple
with it, as if you had the improved grab ability (MM 310).



Soul Slayer Domain Spells
1. Ray of Enfeeblement: Ray reduces Str by 1d6 points
+ 1 point/level.
2. Death Mark: Curses a target marked for death.
3. Death WhipF: Enhances a whip to deal Strength +
Dexterity damage.
4. Black Tentacles: 1d4 +1/level tentacles grapple
randomly within 15 ft.
5. Slay Living: Touch attack kills subject.
6. Harm: Deals 10 points/level damage to target.
7. Circle of Death: Kills 1d4/level HD of creatures.
8. Trap the Soul: Imprisons subject within gem.
9. Soul Bind: Traps newly dead soul to prevent
resurrection.



Death Whip
Necromancy
Level: Wiz 3, Soul Slayer 3
Components: V, S, F
Casting Time: 1 standard action
Range: Touch
Target: Whip touched
Duration: Concentration, up to 1 round/level; see text
(D)
Saving Throw: None
Spell Resistance: Yes
A dull streak of grey trails the whip and a faint moan is
heard when you crack it. The whip feels clammy to the touch,
and those struck by it have limp motions.
This spell uses a whip as a conduit for negative energy
from the Gray. A creature damaged by the whip takes 1d2
points of temporary Strength damage. The damage is also
dealt if the wielder trips a creature with the death whip.
You must maintain concentration on the whip to sustain
this spell, but if you wield the whip yourself, you may
attack with the whip as normal while maintaining
concentration.
Focus: The target whip.


Death Mark
Necromancy [Mind–Affecting]
Level: Wiz 2, Soul Slayer 2
Components: V, S, M
Casting Time: 1 standard action
Range: Medium (100 ft. + 10 ft./level)
Target: One creature
Duration: 1 min./level
Saving Throw: Will negates
Spell Resistance: Yes
The shard of obsidian turns to black dust. Your victim takes
a gray pall to the skin, which feels clammy and rubbery, as if
entering a severe shock.
This spell marks the target for death. The target feels
hopeless and ill, feeling as if it had one foot in the grave.
The target becomes sickened and loses its Dexterity bonus
to armor class.
Material Component: A small shard of obsidian.

[Jack_Simth]

Assuming 3.5?

Probably not one I'd pick. Soul Bind, Harm, and Slay Living you get anyway as a Cleric, Trap the Soul is too expensive for normal use, Death Mark and Death Whip are somewhat lackluster spells compared to other Cleric spells of their level (Sound Burst, for instance, can make people lose their turn, and that's pretty much death right there in D&D ... and it's in an area), and Circle of Death is pretty much only useful on mooks, so the only real gems on the spells are Ray of Enfeeblement and Black Tentacles. The Granted power... useful for certain builds, or as a 1-level dip for some monsters, not so useful to a bog-standard PC.