But you know what's better
Given that Cogsworth Grandfather Clock also has Ward, which prevents it from being targeted, its possible to get Cogsworth Grandfather Clock out early and keep him play for a while to give your other cards a powerful buff
The Hidden Agenda cards with a color in the casting cast pose interesting color restrictions

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Whenever you cast a spell, if mana from a Treasure was spent to cast it, you draw a card and you lose 1 life