ixalan booster box opening The Lost Caverns of Set Boosters – Mox Boarding House Magic: The Gathering Ixalan Booster

You stockpile them and they persist across phases and turns until you spend them

They're not as good here as they are in the early days of the TCG, and in the early days of the TCG, they were barely any good at all

Then for each card you put on top of your library, you draw a card and you lose 3 life

Common usage involves summoning this into a board, beating over a threat, and then using its effect to force out or remove another threat

A gentle wipe with a soft, dry cloth can help maintain their appearance

Fewer Mulldrifters also makes Makeshift Mannequin worse, fewer Snow-Covered Islands make Scrying Sheets (and to a lesser degree, Mouth of Ronom) worse, and fewer first-turn Blue sources make Ponder worse