Would love to slap a Sword on this guy, especially of the Feast and Famine variety. Untapping lands to cast spells sounds good to me? (Double strike untapping twice, so you can cast an instant in between first strike damage and normal damage!)
Kinda agreeing with this sentiment though:
When I cast a 3 mana card I want to lock down the game (Moon effects) or get the card I want immediately (Imperial) rather than waiting for a turn.
Even the "mighty" True-name nemesis has some of the same issues in vintage because it does neither of these things.