The mana value of the spell remains unchanged, no matter what the total cost to cast it was
Archazia's Island brought the ridiculous Giant Cobra, Ghostly Serpent dual-ink card that made this deck able to burn through characters and gain tons of lore with slithering ease
Invasion of Xerex // Vertex Paladin Flip rating: Maybe don't use at all
Ice Magic is generally better than Stuck in Summoner's Sanctum due to its flexibility and that it triggers 4+ payoffs
In our experience as collectors of card games, these decks usually have 1-2 unique cards you can only get inside one of these decks, also if you are looking to gain value and sell it in the far future, there are other great Lorcana products to do it with
The gnome has flash, so you can plop it down in response just as your foe cracks an Evolving Wilds (it triggers off Fetchlands too)