I dont want you to get your hopes up for nothing - (vintage) PSA 10 cards are almost never perfect
So unless there is some pattern where similar cards appear to be rarer or more common, or the sample size is a lot larger, brute force wont deliver definitive answers (though it is still interesting of course)
Consider its card type, any effect that affects when you could cast it (such as flash) and any other effects that could stop you from casting it (such as Meddling Mages effect) to determine if and when you can do this
That does not require that you do so with the same or others, so you could choose to swap your dumpy 2/2 Commander with a lot of text with your much bigger 7/7 Hydra that you cast to beat away
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7 Feral Encounter Feral Encounter is a cost-efficient way to get a creature from the library's top onto the battlefield, although casting that creature's mana cost and Feral Encounter's own cost means this card is best used in the mid to late game