probably bad idea

Prospective 4-Link:
Raise Zombie - Multistrike - Faster Attacks - Melee Physical Damage

Lvl 23 Raise Zombie (21/20 in +2 minion gems helm):

Base stats:
6148 life
834–2085 damage (1459.5 avg per attack)
0.85 attacks per second

21/20 Multistrike:
20% increased melee physical damage
95% more attack speed
30% less attack damage

20/23 Faster Attacks:
55.5% increased attack speed (44% from lvl 21, 11.5% from 23% quality)

21/20 Melee Physical Damage:
50% more melee physical damage
10% increased melee physical damage

Life modifiers:
Flat increase/decrease: +5000 zombie life (Mon'tregul's Grasp)
Increased/Decreased: 20% increased minion life (20% quality on Raise Zombie)
More/Less: N/A
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Total life: (6148 + 5000) * (1 + 0.2) = 13,377.6 life
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Attack speed modifiers:
Flat increase/decrease: N/A
More/Less: 95% more attack speed (21/20 Multistrike support)
Increased/Decreased: 55.5% increased attack speed (20/23 Faster Attacks support)
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Total attack speed: (0.85) * (1 + 0.555) * (1 + .95) = 2.577 attack speed (7.731 attacks per second with Multistrike)
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Damage modifiers:
Flat increase/decrease: N/A
More/Less:
100% more minion damage (max rolled Mon'tregul's Grasp)
50% more melee physical damage (lvl 21 melee physical damage support)
30% less attack damage (Multistrike support)
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Total: 120% more
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Increased/Decreased:
20% increased melee physical damage (quality on Multistrike)
10% increased melee physical damage (quality on Melee Physical Damage)
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Total: 30% increased
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Total avg damage per hit: 1459.5 * (1 + .30) * (1 + 1.2) = 4174.11
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Putting it all together:
4174.11 avg damage per hit * 7.731 attacks per second = 32,270 DPS per zombie

Assuming a maximum of 4 zombies with Mon'tregul's Grasp, 129,082 total DPS