Forum:Spell Field The gates of Dark World

hi guys, please, when my opponent Active the effect of the card of the field, the gates of dark world - All Fiend-Type monsters gain 300 ATK and DEF. Once per turn: You can banish 1 Fiend-Type monster from your Graveyard; discard 1 Fiend-Type monster, then draw 1 card.

it pays the cost:

Opponent: 1- Once per turn: You can banish 1 Fiend-Type monster from your Graveyard;

Me: 2- at this time, active mystical typhoon to destroy the field;

Question, my opponent can still discard 1 Fiend-Type monster, then draw 1 card?

--MikaiLord (talk • contribs) 22:44, December 18, 2011 (UTC)