Where do you agree or disagree
Put another way, thats 24 Food
Again, it's not card advantage in and of itself (since you draw three, and then discard three + lose the Coliseum), but it combines famously with Deep Analysis and madness cards (such as Circular Logic), and its effect can't be counterspelled
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Those creatures can't block this turn
This means your opponents won't be able to destroy one of your gates between searching for it, putting it into play, and checking if you have 10 gates in play (but they can respond to the initial activation to keep you off 10 gates)