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Slow = support skill
Speed boost = support Skill
Shield = support skill
AoE Taunt = Tank (though Morgana also has an AoE disable ulti and is not considered a tank)
Passive = Tankish
No damage = no carry
No innate durability = no tank.
Galio IS a support tank. Before he used to do so much damage that he was support/tank/carry (kinda like amumu is tank/carry if he farms enough). Now even fed galios are really weak.