Last year, one of those cards for $90,000 at auction.
Temporary Lockdown is pretty low-cost for a white deck, but anything with a mana value under two gets whisked away to exile while this enchantment is in play
For those who don't know, "holo" refers to the holofoil effect in the picture, and "shadowless" refers to the lack of shadow between the gold border and the blue background (later cards added a "shadow" to give the card depth.) Both of these properties make the card more valuable, and when combined with the 9 rating, you get the $2,200 price tag

Heres how it plays out: You are required to have The Gitrog Monster out, Dakmor Salvage in hand and more than 7 cards in hand total At the end of the turn, discard down to hand size, discarding Dakmor Salvage This gives you a draw card trigger from The Gitrog Monster Priority passes to opponents On resolution of the draw trigger, replace this with the dredge from Dakmor Salvage, milling 2 cards and returning Dakmor Salvage to hand As it is still the cleanup step you still need to discard down to 7 cards in hand, again discarding Dakmor Salvage and repeating the combo above on a loop The idea is you loop this to fill your graveyard and try to win from there
How Do You Make a Card Disappear
You might have to, tragedy of tragedies, use both barrels and even a spell