These decks are already pricey at MSRP ($70), but still probably worth it at that price
If an effect causes Purphoros to lose all abilities, its ability that causes it to stop being a creature still applies if appropriate
Keep In Step kicks in at the end of the turn
2 Ariel - Sonic Warrior 220/204, Steel There's no way to give Ursula the stage without giving Ariel a spotlight to match, and Disney Lorcana: Ursula's Return definitely does that with Ariel - Sonic Warrior
There are three drops in total: Weapons, Grimoire, and Game Over
If a permanent that's already on the battlefield without time counters on it becomes a copy of a permanent with vanishing, it will stay on the battlefield indefinitely (unless time counters are somehow put on it later)