Summon unhappy girl as soon as you can, and pass the turns to stall the duel. Get BEUD out before the last turn and leave a monster slot open for vassal. Use vassal and union attack combo on the last turn.
If you don't have union attack, you can use Cu Chulainn with Blue-Eyes White Dragon, ritual weapon and riryoku instead.
Yami Yugi's phantom beasts has 1700 - more than 2000 ATK averagely, and they helps other phantom beasts by their own effects. You will need equip spells or Wonder Balloons to defeat Yugi's phantom beasts with your monsters.
Inflicts 500 effect damage to your life points when it destroys your monsters.
Can be summoned by tributing only one monster.
How to defeat Yugi's deck
Decreases the ATK of Yugi's monsters
Since Yami Yugi's Phantom beasts will gain ATK by 300-900 based on the number of Cross-Wing in the graveyard, it is difficult to beat them with your monsters without ATK boost spells or Wonder Balloons.