Vicious Conquistador does not deal damage with its ability, it causes loss of life, which is not the same. Usually damage to a player causes loss of life, but it can also cause several other things (like poison counters). Loss of life is the result of damage, not the damage itself. You can have loss of life without damage in many ways. The Conquistador is one such example.
But yes, any source of damage will cause its controller to gain life if it has lifelink, no matter how or why it gets to deal damage.
Guttersnipe says that the creature deals the damage. viscous conquistador does not.
But yes, any source of damage will cause its controller to gain life if it has lifelink, no matter how or why it gets to deal damage.
Former Rules Advisor
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(The Gamers: Dorkness Rising)
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(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)