At a time when draw options were limited, this ability gave players a reliable way to recover from bad hands
First strike happens, killing one off, and then normal damage takes your Thalia down
If the result is 10-19, you can copy that card, but instead of paying the cost, you can just pay one mana
This problem grows exponentially as you add more cards, so it's important to include plenty of cards that aren't permanents and numerous ways to get rid of permanents (these two categories can overlap a lot)
Super Deck 9.8 17 [49669] JP026 Dark Beckoning Beast Effect Monster - 2 Fiend 0 0 When this card is Normal Summoned: You can add 1 "Uria, Lord of Searing Flames", "Hamon, Lord of Striking Thunder", or "Raviel, Lord of Phantasms", OR 1 card that specifically lists any of those cards in its text, from your Deck to your hand, except "Dark Beckoning Beast"
A PSA 10 can be worth 10-100x more than the same card in PSA 7