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They have less options on the type of permanents they can get but they have less restrictions on the mana value

These cards are printed as if they were a card from an old set, using the same art, card frame, text, and set symbol

If youre on an aggro plan, you might consider the efficiency of White Orchid Phantom as an early disruptor that can turn a powerful land into an innocuous basic land, making it one of my favorite newer cards

As for this particular variant being so expensive

Delve allows you to exile cards from your graveyard in exchange for paying the mana cost

Discounting Wasteland (Valley of Gorgoroth), the most expensive player rewards card is textless Damnation at just under $25 and most of the promos - even the playable ones - are $10 or less