Fishborg Harpooner (LEDE-EN032)

You can reveal this card and 1 WATER monster in your hand; Special Summon 1 of them and discard the other. You can only use this effect of "Fishborg Harpooner" once per turn. If this card is sent to the GY as material for a WATER Synchro Monster: You can negate the effects of 1 Effect Monster your opponent controls, until the end of this turn.