Glade Riven
Adventurer
One thing I liked about 4e monster design over 3e was the sheer amount of powers (especially for high level monsters) got trimmed down, often paired with a recharge mechanic of "roll a d6." I'd like to see it on the player side, perhaps as a replacement for the "Encounter Power" - Roll a check to recharge that power, ability, or spell at the end of your next turn. It prevents "spamming" a low-level power, unless a player is really lucky - even then, the power could only be used a maximum of every other turn.