I know I plan on making room for this card in my own Zedruu deck
If a permanent that is represented by a transforming double-faced card becomes a copy of a Siege, it will be exiled as that Siege's triggered ability resolves, then it will be cast transformed
High-value cards with few reprints tend to hold their value more than cards with multiple versions
It's never certain how hot demand will be for these until the big day comes - but we'd venture this collection is going to burn through its stocks very quickly indeed
Like many of the Special Guests appearing in Aetherdrift, Whir of Invention has some synergy with Aetherdrift
The first two abilities are good enablers, creating tokens and drawing cards at the "cost" of untapping your creatures, but the final one is an alternate win condition : If you have fifteen tapped creatures and five white mana available, you can use Halo Fountain to just win the game