This would be fun to combo cards with! The 3-mana slot though, hmm...
Some clarifications after asking a few questions:
It's exactly like Faceless Manipulator, you select a minion on the battlefield to become.
How is this exactly the same as Faceless Manipulator? Let's say I use Faceless Manipulator on Obsidian Statue, I get the exact same card with stats of 4/8. If I use Alderam on Obsidian Statue, I get a 3/3 minion.
You could technically have it in with all those, you simply need to draw them out of the deck before using the prince, which is at least plausible if not ideal for quest mage. However, the fact that it's part of the same standard rotation as molten reflection and Simulacrum probably permanently means it won't find a home in exodia.
Could Hemet activate that for like Malygos combos etc.?
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Let's say I use Faceless Manipulator on Obsidian Statue, I get the exact same card with stats of 4/8.
If I use Alderam on Obsidian Statue, I get a 3/3 minion.
Voted bad.
Can't think of a deck that wants this. No idea what to use it for, and the restriction is harsh.
What about usage in Quest Mage? Copy Sourcerer's Apprentice ...
Anger is the punishment we give ourselves for someone else's mistake.
You could technically have it in with all those, you simply need to draw them out of the deck before using the prince, which is at least plausible if not ideal for quest mage. However, the fact that it's part of the same standard rotation as molten reflection and Simulacrum probably permanently means it won't find a home in exodia.