The two Palkia cards being the most expensive make it seem as though it might be preferred to Dialga, but either one will pay for plenty of Pokmon TCG investment cards and unopened boosters
It is not a card you can just play on curve so that you didn't waste mana
If you're already planning to grab booster packs, video games, or anything else from the shop, taking credit gives you the best return on your collection
I myself, never really used the Factorys ability to boost other Assembly Workers, unless I didnt have the Mana to attack with two of them separately
Back before magicthegathering.com existed, there was a site (and print magazine) run by Wizards of the Coast called The Sideboard that featured strategy written by some of Magics top pros
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