During the Main Phase (Quick Effect): You can Tribute 1 other Level 7 or higher monster from your hand; Special Summon this card from your hand, also you cannot Special Summon for the rest of this turn, except monsters with a Level. If this card is Special Summoned while you control another "Ursarctic" monster: You can target 1 face-up monster your opponent controls; change it to face-down Defense Position. You can only use each effect of "Ursarctic Megatanus" once per turn.