This effect targets the face-up monster you control. [1]
You refer to the target’s current Level on the field when this effect resolves. [1]
If the target is no longer face-up on the field when this effect resolves, you don’t Special Summon a monster. [1]
If your opponent takes control of the target before this effect resolves, you still Special Summon a monster. [1]
You refer to the current Level of the monster in your hand when you resolve this effect, including all modifications from cards like "Cost Down". [1]
If there is no longer a monster in your hand that you can Special Summon when this effect resolves, your opponent may briefly verify that this is the case. [1]