Say I activate the ability of the {Vizkopa Guildmage} that says "whenever you gain life, each opponent loses that much life" and I have exquisite blood out. I then do damage to an opponent, say for example reasons, with a creature. I would gain life because of the {exquisite blood}.Does the Guildmage ability trigger then.
If so, wouldn't the {exquisite blood} trigger again and ultimately be an infinite buff?
Yes, this is an infinite combo. All you need to do is gain life, or damage the opponent, and it goes infinite.
RESOLVED
See also {Sanguine Bond}.