Obelisk would defeat Slifer in a battle

Thank you, ethopia, for your response. 1. Power It is true that Slifer's second mouth deducts 2000 points from Obelisk's ATK. However, given that I'm increasing Obelisk's ATK to infinity, 2000 points is completely insignificant. This also assumes that Obelisk was summoned after Slifer, which isn't necessarily true. My opponent claims that Slifer can destroy any face-up cards; this is false. Slifer's second mouth (aka Thunder Force) operates like this: when Slifer's opponent summons a monster, Slifer blasts that monster with its second mouth, deducting 2000 ATK from its ATK [1]. The monster is only destroyed if it couldn't afford to lose 2000 ATK; however, my chosen monsters Dark Magician [2] and Buster Blader [3] have 2500 and 2600 ATK respectively, and therefore survive with 500 and 600 ATK. In fact, when Yugi summoned Buster Blader against Slifer, and Slifer responded with its Thunder Force, Buster Blader survived, clear evidence that my opponent's claims are false [1:1]. That, or a card like Card Guard [4] could protect the planned sacrifices, preventing Slifer's Thunder Force from working. The Dark Magician and Buster Blader would survive, and be used as sacrafices for Obelisk's Soul Energy Max, increasing Obelisk's ATK to infinity and allowing it to easily overpower Slifer the Executive Producer. 2. Yu-Gi-Oh battles It is true that Yugi defeated Seto. However, there are a few reasons why we can't use this as evidence for Slifer being superior to Obelisk: A. In the duel, Obelisk and Slifer "collide for mutual destruction," defeating each other. This is useful evidence for me as well. After the collision, Yugi won, sure, but he didn't win using Slifer, and Obelisk only made one other brief appearance in the remainder of the Duel. B. Kaiba actually had the chance to defeat Slifer and win the duel, as he had activated Soul Energy Max in his second turn of Episode 131 [5]. However, he went for the direct route and tried to take out Yugi's Life Points instead, probably expecting Yugi to use some Trap or Spell card to block an attack, but not an effect. Kaiba misplayed, however, because Yugi was able to block the effect with the Kuriboh in his hand. C. While Kaiba may be great, Yugi is the King of Games. Yugi and Yami together always managed to defeat Kaiba, Egyptian God card or not. (The one loss atop Pegasus' castle doesn't count because Yugi only lost due to Kaiba's suicidal threats; this doesn't reflect his dueling skills at all.) Alone, Yugi even managed to destroy all three Egyptian God cards in one turn [6]. As already stated, Kaiba made a serious misplay to give Yugi the edge. Given the clear superiority Yugi has over Kaiba, Obelisk was handicapped by a weaker duelist when facing Slifer; this handicap was overridden by Obelisk's superiority. (Small note: Kaiba didn't just have "a" Obelisk; he had the one and only Obelisk the Tormentor. "A" underplays this fact way too much. Same goes for Yugi's Slifer.) Good luck, ethopia. [1] http://yugioh.wikia.com... [2] http://yugioh.wikia.com... [3] http://yugioh.wikia.com... [4] http://yugioh.wikia.com...(anime) [5] http://yugioh.wikia.com... [6] http://yugioh.wikia.com...