Even if the activation timing is slow, if you can't block it with a trap, etc., if you succeed with just declaring 5 or 6, you will get a huge return of 5 to 6 cards drawn, and even if you fail and dump 1 to 4 cards, depending on the deck, even this is a return of its own, not to mention risk
return those cards to the hand
Rally the Ancestors Inefficient and temporary, Rally the Ancestors is fine in the kind of deck with like 30 1-drops in the graveyard and a sacrifice theme or a mass of cheap infect creatures
HP can help identify fakes : If a card has an HP value that doesn't match any known printing of that card, it might be counterfeit
This inevitably leads to the acquisition of hundreds, nay thousands, of newly acquired, low-value Pokemon cards sitting on a desk in your house