yugioh card call of the haunted YU-GI-OH! - (NKRT-EN032) - Noble Knights of The Round Table - 1st Edition destroy this card. Call of the Haunted -

While this doesnt negate the actual summon like other traps (i.e

This boosts Aqua Dragons attack by 1000 points (up by 500 for not being in Toon, which decreases its attack and another 500 for terrain bonus)

Common combination examples include: Fusion Summoning "Mirror Force Dragon" with "Mirror Force," Fusion Summoning "Tyrant Burst Dragon" with "Tyrant Wing," Fusion Summoning "Doom Virus Dragon" with "Crush Card Virus," and Fusion Summoning "Destruction Dragon" with "Ring of Destruction." 9 Ruling Details (Konami FAQ) The Special Summon performed by this card's effect is not treated as a Fusion Summon

Summon Limit When it comes to Trap cards, Floodgates are generally among the best

So yes, you really do win with Exodia during your opponents turn