While the equipped monster battles, your opponent cannot activate any Spell/Trap Cards until the end of the Damage Step. When an attack is declared involving the equipped monster: Face-up Spell/Trap Cards your opponent controls have their effects negated until the end of the Damage Step (even if this card leaves the field). When the equipped monster destroys an opponent's monster by battle: You can destroy all Spell and Trap Cards your opponent controls. When this face-up card in a player's Spell & Trap Zone leaves the field, that player takes 3000 damage.
I have funny experience with this card. I used DM deck and my opponent used BEWD deck. I summon Mgcn Rod (search DMC then activate it but got no DM/Navi) then attack directly (I got 2nd turn) then on my opponent turn, he summoned BEWD with those "eyes of blue" tuner support then equip white veil to BEWD and then attack mgcn rod. Then I set power breaker then he attacked again then you know the ending.
Sartorius has dialogue with this card even though it's not part of his deck (at any level)
I noticed it because i use this card (Sōbi Mahō, Shiro No Veil!)
Why does he say White in japanese i dunno but Black Magician is mentioned as BURAKU)
PS = Also has dialogue when using Monster Reincarnation (tho' i don't have this one)