I think most respondents to DaFurryFury's argument are focused on the wrong thing. It is not what you could do instead of playing the Mana Crystal but rather what you
can do after playing it. It is not whether the Mana Crystal is a better play than some other card, but rather the options it now affords you to respond to your opponents actions as well as the new options it opens for you in subsequent rounds.
I believe we all can agree that everyone has different styles, strategies, tactics, etc depending upon the mage your playing and the degree of experience you have against your opponent (i.e. their style, strategies, tactics, etc). We all value one card over another as it works to achieve these ends.
My interpretation of "action potential" is what I can now do to respond to actions my opponent has taken or not taken while staying focused on my own strategy. I know I cannot anticipate everything my opponent might do anymore than I can expect to do everything I would like to do when I want to do it.
The Mana Crystal gives me two key benefits:
- Long-term channeling growth
- Extra capability to respond to unforeseen actions on the part of my opponent
Am I sacrificing the play of some other spell so I can play the Mana Crystal? Of course I am but that is a decision we make with every spell. My opponent did so too with whatever they chose in the early game. Maybe it was armor that they won't need until round 6 or maybe it was for a wand that I later dissolve before they ever use it; whatever it does not matter, we all make choices.
What I am wanting, is to be in a position as early as possible to respond to my opponent when necessary while keeping my eye on the end game when I can (hopefully) overwhelm them. I want more mana and especially more than my opponent. This may take several rounds but I know the game will last at least that long and I plan my strategy for it.
I assume we will both spend our starting mana quickly on things we want. The subsequent rounds will be all about what we're willing to bank and our channeling. This is where the "action potential" comes into play. As the game unfolds we both will eventually find ourselves in a position where we need to respond to something our opponent has done. If I can channel 11 vs. my opponents 10 then I am in a better position to not only respond but possibly doing so while still moving forward with my own strategy and tactics. If I don't need to respond then I am in a better position to force my opponent to respond to my actions because I am spending more each individual round than they are.
Bottom line is that I see value in the 5-mana "sacrifice" that the Mana Crystal gives me on the rounds immediately after its cast. It is an investment in the near and long-term future that I am after and worth whatever else I might play that needs that 5-mana.
Is this true in all situations? No .
Could my opponent surprise me and attack aggressively at the start? Sure, but I don't think 5-mana will put me at too much risk.
Could I have banked the 5-mana and used that as my "action potential"? Sure, but would I ... probably not (I'd likely spend it on something else).
Could my opponent play something that might prove, in hindsight, to be more valuable than my Mana Crystal? Of course. But will they? We'll never know until we play.
BTW - while I often have this spell in my book I usually don't cast it until rounds 3 or 4. I have more important spells to get out early (e.g. spawnpoints, large creature, or something else that my strategy requires be out early). This also allows me to get a early read on my opponent's likely strategy and know whether it is "safe" to cast the Mana Crystal or if I need that 5-mana for some immediate response. Baring an immediate need then I cast it and continue on with my own game tempo.