With even a few counters or a single pump spell, Boo can reliably kill some of the biggest creatures in the format, like Gitrog, Serra Ascendant, Vilis, and Tasigur
A few reasons: Your decks mana curve is a bit lower than the average 17-land deck with only a few cards costing more than three mana
If you kill the Goblin to slow their ramp, they still get the other chapter effects
Rewrite history with the Assassin's Creed card Hidden Blade, available with purchase of a sealed display box of Magic: The Gathering Assassins Creed Beyond Booster, Collector Booster, or Starter Kit, only in WPN stores while supplies last
All attendees should get the standard promo, as long as there arent more than 40 players
But no matter how good your proxies are, you should not sell them as real cards or mislead anyone about what they are