You'll find two Alternate-Border cards rated Rare or higher in the separate Collector Booster Sample
Since Don
In theory, these cards are relatively fair, high-variance effects under normal deckbuilding circumstances, you're likely to swap what's on board with something of similar-ish value, although the obvious highroll (or lowroll) potential is enticing
Sure, its powerful and will give you a lot of extra value, but Id much rather get five, six or even ten cards from this list before buying just it alone
The Cycle of MKM Clue Equipment If theres one card type that sometimes needs a failsafe, its equipment
Spell and trap removal is necessary in any deck, and the ability to set a card following this removal is another nice addition that can help speed up a trap card