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After that, investigate became what Wizards calls a deciduous mechanic

When one or more cards are milled this way, exile target enchantment, instant, or sorcery card with equal or lesser mana value than that spell from an opponent's graveyard

What made this a very popular spell over the years is the versatility that it offers since it's not just an expensive spell with a powerful effect that you might never get to play

Transformed they become Olag, Ludevics Hubris, a monstrous Zombie 4/4 that reads, As this permanent transforms into Olag, Ludevics Hubris, it becomes a copy of one of the exiled cards, except its name is still Olag, Ludevics Hubris, it has base power and toughness 4/4, and its a black and blue Legendary Zombie in addition to its other colors and types