Bard, Shaman, Enchanter fit your criteria the best.
I'll add Druid as an honorable mention for versatile caster class because of ports, though they aren't as desirable for groups at the highest levels.
Ports are really nice though, they shorten your travel time, let you LFG worldwide, and make you money.
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[60 Warder] Kline (Wood Elf) <Bregan D'Aerth>
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