vs
Mystic Mine
Card Text: If your opponent controls more monsters than you do, your opponent cannot activate monster effects or declare an attack. If you control more monsters than your opponent does, you cannot activate monster effects or declare an attack. Once per turn, during the End Phase, if both players control the same number of monsters: Destroy this card.
Blue Eyes Alternative Ultimate Dragon
Card Text: “Blue-Eyes White Dragon” + “Blue-Eyes White Dragon” + “Blue-Eyes White Dragon” Your opponent cannot target or destroy this card with card effects. Once per turn: You can target 1 card your opponent controls; destroy it. If this card was Fusion Summoned using a monster whose original name is “Blue-Eyes Alternative White Dragon” as material, you can target up to 3 cards your opponent controls instead. This card cannot attack the turn this effect is activated.
The Verdict
Case 1: Player-A controls Blue Eyes Alternative Ultimate Dragon and Player-B controls Mystic Mine, Player-A controls more monsters than Player-B: Blue Eyes Alternative Ultimate Dragon will not be able to activate its effects or attack, however the passive effect of “Your opponent cannot target or destroy this card with card effects” is still in play.
WINNER = Mystic Mine
Case 2: Both players control the same amount of monsters: Blue Eyes Alternative Ultimate Dragon can activate its card destruction effect and destroy cards / monsters on the field, assuming Mystic Mine is destroyed first before any monsters on the field are destroyed.
WINNER = Blue Eyes Alternative Ultimate Dragon