Last week a situation has come up while this ending card was in play, the spell Generosity is the most devastating spell that can be cast while this is in effect.

The situation is one player (Player A) cast Generosity to another player (Player B) (this was a 3 player game), myself (Player C) I casted Hydra spell, we couldn't agree what should happen in this case.

Assume player A has 5 gold, player B has 10 gold, player C has 7 gold, it is obvious that player B will have no gold left, what is not clear is should I get 10 + 5 gold or only 5 gold, we decided that I would only get 5 gold.

You shouldn't have got any gold! The Hydra Spell means that the player who cast Generosity can target the spell against any other characters as though he cast it individually on each player. The only caveat is that you decide which other players are affected. If you decide to target the player who cast the Spell, he is not affected by it (he cannot give his gold to himself!). For the Hydra Spell to be effective, you would need both the Generosity Spell and Hydra Spell in your spell pile.

In your example, player A would get 10 gold from player B. You as player C wouldn't cast the Hydra Spell, as it wouldn't affect player A and you most certainly would not target yourself with the Hydra Spell.

The best use of the Hydra Spell, is when you cast a spell on another player and immediately follow it up with the Hydra Spell!

Ell.