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The ability triggers when Borborygmos Enraged deals combat damage, even if at the same time it's dealt lethal damage itself. Before it's put on the stack, though, state-based actions see lethal damage marked on it and destroy it, causing it to go into your graveyard. If nothing else happens, the ability will go on the stack, resolve, possibly draw you an amount of lands, but by the time you could activate it's ability to discard lands, Borborygmos Enraged will already be in your graveyard.