(You may cast this card from your hand for its warp cost. Exile this creature at the beginning of the next end step, then you may cast it from exile on a later turn.)
in its mana cost, X is 0 for the purpose of determining its mana value.Anticausal Vestige rewards leaving the battlefield rather than entering it. When it leaves, you draw a card, then may put a permanent from your hand onto the battlefield tapped if its mana value is no greater than the number of lands you control. That can turn removal, sacrifice, or a planned exile into another useful permanent.
Warp provides a built-in way to trigger the ability. Cast the Vestige from your hand for four mana, use the body for the turn as appropriate, then exile it at the next end step. Leaving generates the card draw and possible permanent deployment. On a later turn, you may cast the Vestige from exile, paying its applicable cost rather than receiving a free return.
The card drawn by the trigger can be the permanent you put onto the battlefield. Lands count as permanent cards with mana value zero, so the effect can also supply another land when a more expensive option is unavailable. The permanent enters tapped, which affects immediate use of mana rocks and creatures with tap abilities. Entry triggers can still provide value immediately.
With five lands in play, the exit trigger can deploy a permanent costing five or less. With eight lands, its range expands considerably. That gives land ramp a second job beyond paying for the Vestige: it improves the quality of the card you can deploy when it leaves.
Blink effects can trigger the leave ability while returning the Vestige for future use, and sacrifice outlets give you control over when it happens. Land ramp improves the range of permanents you may deploy. The best home is a deck with enough lands and worthwhile permanents in hand to make that exit productive, rather than relying solely on the six-mana creature's combat contribution.
