When you can exchange cards with low situational value: creature removal against control decks, surplus lands in the mid-to-late game, etc
Each Storm Emerald Box contains 30 factory-sealed booster packs, with 5 cards per pack, offering plenty of opportunities to discover powerful Pokmon ex, Full Art cards, Art Rares (AR), Special Art Rares (SAR), Secret Rares (SR), Ultra Rares (UR), and other highly collectible cards exclusive to the Japanese release
Waiting saves real money on everything below BWR tier
If youre also dipping into artifacts whether permanents, or in token form (treasures, clues, etc) then youre double dipping on value with Vat of Rebirth
The particularly thematic Shoot the Sheriff is always at the ready to remove a powerful opponent that doesnt share her Keywords