Spell binder and mirror entity interaction

I used toggle waggle scheme to play around counter spell, instead it proc the mage spell binder secret

I then drew the spell binder and tried to play around mirror entity, to my surprise after playing the spellbinder his mirror entity didnt proc, and i played my pogo, and then the mirror entity went off copying my 7/7 pogo.

Was the opponent’s board full when you played the Spellbinder, but not full when you played the Pogo?

Nope, i played spell binder and then the pogo.

You keep saying “spell binder”.

Are you talking about the mage secret? Which is Spellbender, btw. Or another card?

Details matter.