charizard pokemon card high resolution This Pokémon card just sold

Yes, you can use this card as intended and copy a powerful spell, but you can also attach it to something weaker and hope that players hold onto their counterspells as they anticipate a big move, allowing you to cast other spells instead

(Some effects from cards in previous sets may cause these to transform while on the battlefield, though these effects are unusual.) Double-faced cards haven't changed since the last time we saw them in Innistrad: Crimson Vow

Thats all well and good, and is pretty clear from the onset

If the targeted creature becomes an illegal target before Unagi's Spray resolves (perhaps because it left the battlefield), the spell will not resolve