On my turn I have Lotus Vale in play or on the field, as per rule under a land each turn, it enters the field Vesuva , as it enters capped and copies any land on the field I choose to enter as a copy of Lotus Vale, my question is: Vesuva being the copy of this land, then should I sacrifice two untapped lands? Or how vesuva works, explain me please
It enters as a copy of the land chosen so treat it exactly as you would the original land. You may sacrifice two untapped lands and if you do Vesuva (now a Lotus Vale) will enter the battlefield tapped (because of Vesuva's effect) and if you choose not to sacrifice it will go to the graveyard instead.
Replacement effects are applied to the event they replace in order, one after the other. Control change effects take precedent over copy effects, which take precedent over the rest. The controller of the affected permanent (or its owner if it has no controller) chooses one effect to apply, but must follow this general order, applies it, then chooses the next effect from all that are applicable then, but still following that general order. (see rule 616. for more details).
So when Vesuva would enter the batlefield, its own effect as the only applicable copy replacement effect for that event is applied. But after it gets applied, the game checks again for applicable replacement effects, of which there is another one now, namely the Lotus Vale's effect. So that effect is applied. Then no more effects are applicable and the modified event (Vesuva entering the battlefield or the graveyard) occurs.
Replacement effects are applied to the event they replace in order, one after the other. Control change effects take precedent over copy effects, which take precedent over the rest. The controller of the affected permanent (or its owner if it has no controller) chooses one effect to apply, but must follow this general order, applies it, then chooses the next effect from all that are applicable then, but still following that general order. (see rule 616. for more details).
So when Vesuva would enter the batlefield, its own effect as the only applicable copy replacement effect for that event is applied. But after it gets applied, the game checks again for applicable replacement effects, of which there is another one now, namely the Lotus Vale's effect. So that effect is applied. Then no more effects are applicable and the modified event (Vesuva entering the battlefield or the graveyard) occurs.
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