Veil of Summer interaction

Hello, I tried googling this interaction, but I can't find the answer.

The example is if there is a stack of spells such as

(Bottom of stack to top)

Opponent: Taps out for Rise of the Dark Realms

Me: Spell Pierce

Opponent: Fierce Guardianship

Me: Veil of Summer

Would the Spell Pierce be un-counterable after the Veil of Summer resolves? This is assuming no other interaction happens. Thanks!