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Yusei and Mukuro each have 0 SPC. Mukuro summons [[Burning Skull Head]] in [[Attack Position]] (1000/800) and [[Set]]s 3 cards.
Yusei and Mukuro both have 1 SPC. Yusei summons [[Speed Warrior]] (900/400) whose effect doubles its ATK during the Battle Phase (1800). He attacks Burning Skull Head, but Mukuro activates [[Zero Guard]], reducing Burning Skull Head's ATK to 0, but letting it survive the battle. (Mukuro 2200) Mukuro then activates [[Death Accel Zone]], which prevents him from losing 1 SPC via Speed World, and instead gains 3 SPC. Yusei Sets 2 cards and Speed Warrior's ATK returns to normal.
Mukuro has 5 SPC and Yusei has 2. Mukuro activates [[Speed Spell - Summon Speeder]], which lets him [[Special Summon]] [[Skull Vase]] (800 ATK). However, at that time Yusei activated Slip Stream, but Mukuro did not notice. Mukuro [[Tribute]]s both his monsters to [[Tribute Summon]] [[Skull Flames]] (2600 ATK). Since he Tributed Skull Vase for it, he gets to draw 1 card. He attacks Speed Warrior with Skull Flames. (Yusei 2300, 1 SPC). Mukuro also activates [[Speed Booster]], which (since Mukuro has more SPC, Speed Booster deals the difference in Speed Countersx100 as damage) deals 400 damage to Yusei (Yusei 1900)