For as long as Secret Lair cards remain this difficult to get ahold of, both at and after release, price spikes like Geralfs Messengers are likely to continue.
With mana burn gone from the game though, this downside on the card is no longer relevant
Best Disney Lorcana starter decks: Whispers in the Well Sapphire and Steel Azurite Sea Emerald and Sapphire Whispers in the Well Emerald and Amber Fabled Emerald and Ruby Shimmering Skies Ruby and Amethyst Reign of Jafar Amber and Amethyst Archazia's Island Ruby and Sapphire Reign of Jafar Ruby and Steel Shimmering Skies Emerald and Steel Fabled Amber and Sapphire Archazia's Island Amethyst and Steel Azurite Sea Amber and Ruby Rise of the Floodborn Amethyst and Steel The First Chapter Amber and Amethyst Ursula's Return Sapphire and Steel Rise of the Floodborn Amber and Sapphire The First Chapter Sapphire and Steel Into the Inklands Amber and Emerald The First Chapter Emerald and Ruby Ursula's Return Amethyst and Amber Into the Inklands Ruby and Sapphire Whispers in the Well - Sapphire and Steel Best cards: Judy Hopps, Uncovering Clues

If the targeted spell has a triggered ability that copies it (for example, replicate or storm), the copies will be controlled by the player who cast that spell
A card can only be in one zone at a time, and which zone its in currently changes how the rules refer to it and how you can use it
This was a couple weeks ago