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At time of writing, there are only two known commons that reward this unnamed mechanic: Arena Trickster, which turns from an unexciting Hill Giant into a Rampaging Baloth (and can continue to grow), and Naiad of Hidden Coves, which allows you to play two Vexing Gulls on turn four

Petrified Hamlet 4

There must be another "Ghostrick" monster on the field to activate and to resolve this effect

If the metagame is heavy in those decks, cheating Valgavoth into the battlefield is a bad idea, but if Arclight Phoenix decks are the most played ones, I could see Valgavoth being better even in decks like Indomitable Creativity

Many people who rediscover their childhood collections hope to find hidden treasures, and in some cases, they do