Have you tested it at all?
At first I agreed with tristan about switching the second and third benefits, but I think then you could just play the third Ceremony twice by using the second Ceremony. You could just put a clause about playing a card twice that isn't a Ceremony. I also understand why you would want to draw cards with the second effect - you're trying to draw another Ceremony to get to the third/fourth effect.
I think that any more complicated benefits would make the card too situational.
I almost want to say that the way it is right now, nobody would play more than a second Ceremony, because how many times do you have three of the same kingdom card in your hand that doesn't give a big payout? If I play it twice it's like I played two Laboratories and I can't play any more. Clearly it wouldn't do well in Big Money, so you then need your fourth action card to give maybe +2 coins, assuming the 4 cards left in your hand can give you the other 4 coins you need, but by now you have either 1 or 3 actions left. If that works, then you need some easy way to get an extra buy, perhaps your fourth action card is a Woodcutter. Ideally, then your other four cards will get you 11 or 12 more coins, and that's a bit of a challenge, seeing that you probably don't have too many Golds if you aren't playing Big Money. ...OK at this point I'm rambling.
What I'm trying to say is that your first two are potentially just what this card needs, but the last two feel weak. Perhaps you could make the third effect a Cellar (or double Cellar if it's too weak) and the fourth effect "+(1) per Action card you have in play." This could be very exciting since it already wants you to play an engine.
As for balance, 4 seems perfect since you can't open with two of them, and it should be OK early since your deck is full of Coppers to make it harder to line them up to get to the second effect. It gets more powerful with trashing (like just about everything else). The interaction with Throne Room is actually great; comparing to Ranger, which gives +5 Cards and +2 Buys when Throned: you either get +3 Cards, +2 Actions, look at two cards...trash any...; +3 Cards, +2 Actions, [Throne Room effect]; or +2 Actions, [Throne Room effect], [Workshop effect] (or with my new idea: +3 Cards, +2 Actions, [Cellar effect]; or +2 Actions, [Cellar effect], +(4)[or more]). All of these seem like reasonable effects for playing a Throne Room, especially since you won't be drawing more than 3 cards with Ceremonies.
TL;DR: It theoretically looks very balanced, but the third and fourth effect don't seem as appealing as the first and second effects.