Ideas for Curbing High Level Magic Power

[Cosi]

IThe above ideas can be used to discourage a spray and pray approach to divine spellcasting as well. The idea behind these suggestions being that a player cannot automatically assume he will have access to major spells when he wants them, forcing the player to hold back and use his spells more strategically, consequently shifting the load of most combat situations to other character classes.

This kind of thing is tempting, but it's a bad idea. Mechanics that encourage people not to use their abilities make the game less interesting. People also respond irrationally to limited resource and uncertain refresh rates, which will tend to make the problem even worse.