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It can change its creature type every turn, which is great if your deck cares about more than one type of creature

The rest of the effects that work well for this are the Progenitus ones and as discussed those are generally weaker or just supporting cards

Harmonizing Magician is a great candidate for this, as its a pendulum tuner that special summons its own level 4 non-tuner monster when its pendulum summoned

Decks that want to cast from exile, or want just need draw, or have big whammo turns and need to draw into them are the preferred home

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