"I've got a plan!" is the obvious comparison and unlike what I first thought when looking at it, I think it actually compares fairly well.
I've got a Plan has a slightly higher cost and does not give any bonus intellect. In many cases, you'd probably want to commit a card or two to your I've Got a Plan anyways to ensure you land the hit (missing a 3 cost event really hurts your tempo), so the cost of discarding cards for occult invocation isn't actually as bad it first seems.
This card actually gives you some flexibility to deal 1-3 damage, and choose how much you want to commit. The tradeoff is slightly lower max power (3 vs 4 damage, and commiting 2 cards to I've got a plan might give you up to +4 skill instead of 2 on occult invocation).
The other downside of I've got a Plan is you need a bunch of clues to even use it. Of course, holding even 3 clues isn't hard for a seeker, it's their primary role after all but sometimes the timing is just not right (e.g. right after advancing agenda), or you're playing solo and there are less clues in play, and specific scenarios don't have a lot of clues. Cards in your hand in contrast are always available and relevant for every scenario. In fact, drawing cards are seekers specialty.
I think you'll take this over I've got a Plan if...
-you're playing solo
-your deck has a decent draw engine
-you need to run a lower cost curve
You might lean more towards I've got a Plan if...
-you have high intellect / plan to stack intellect stats and don't need any other boosts
-your fighter might need a bit more help dealing damage vs bosses
-the cards in your deck are valuable in setting up a combo of sorts
-you can grab clues instantly at any time (e.g. working a hunch)