Ok, so some of us were gathered last night and discussing out top cards in game. So I thought I would start a thread and get some discussion going and list what I believe are the top 5.
First, the criteria - in order to make the list, three primary characters were evaluated: Cost, ease of use, effect. Just for clarification cost can mean gold cost, influence cost, or any other type of costs; ease of use can refer to either the ability to trigger/activate the effect and/or the ability to put it in a deck without restriction; effect can be relative to both in game and meta-game effects.
So on to my top 5
1. Golden tooth mines. Easiest repeatable draw in the game.
2. Venomous Blade. Easiest repeatable kill in the game.
3. Castellan of the Rock. Easiest repeatable kneel in the game.
4. The Red Viper (PotS). Costs are high, but clearly the best power grab character in the game.
5. Valar Morghulis. Plots fall into a slightly different evaluation scheme, but I couldn't leave this out of the top 5.