- Decode talker is on the field
- Effect veiler is played during your opponents main phase 1
- Does Decode talker lose the ability to tribute a card and negate effect veiler?
http://yugioh.wikia.com/wiki/Decode_Talker
- Gains 500 ATK for each monster it points to. When your opponent activates a card or effect that targets a card(s) you control (Quick Effect): You can Tribute 1 monster this card points to; negate the activation, and if you do, destroy that card.
http://yugioh.wikia.com/wiki/Effect_Veiler
- During your opponent's Main Phase (Quick Effect): You can send this card from your hand to the GY, then target 1 Effect Monster your opponent controls; that face-up monster your opponent controls has its effects negated until the end of this turn.