Buy Diablo 2 Resurrected Storm Clutches

2 Javelin and Spear Skills
20 Increased Attack Speed "IAS"
4 Life replenish
11 Mana

regeneration mana 10%
3 Mana after each kill "MAEK"

These gloves with a mana leech ring/amulet will give you insane sustain whilst slaying mobs, giving you mana back on even the smaller "trash" mobs.