Bullion investing is the dominant strategy when it comes to coin collecting, and is considered a safe investment historically
Any card thats rare, valuable, sentimental, or in excellent condition is worth considering
Sacrifice a creature like Death Cultist, Mortuary puts it back on top of your library, and Gwenom lets you immediately replay it by paying 1 life
Masques of Hydragrum is moved to soul, and if your opponents vanguard is grade 3 or greater and you did not persona ride this turn, you activate persona ride
Thats not just the most expensive Pokmon card ever
If you are instructed to put a card that isn't a double-faced card onto the battlefield transformed, it will not enter the battlefield at all