If each booster you opened had, on average, one card, then six packs would get you the six cards you need
Once youve made a Treasure or two, you might want to cast your spells pre-combat so Vaan gains the bonus from sacrificing Treasure tokens

7.9%inclusion 8%synergy 35 decks 444 decks Deadly Dispute 7.8%inclusion -5%synergy 207 decks 2.64K decks Obscuring Haze 7.6%inclusion 5%synergy 221 decks 2.92K decks Sorceries Cultivate 62%inclusion 20%synergy 1.82K decks 2.92K decks Spider Spawning 60%inclusion 59%synergy 1.57K decks 2.64K decks Rampant Growth 47%inclusion 15%synergy 1.37K decks 2.92K decks Kodama's Reach 44%inclusion 18%synergy 1.29K decks 2.92K decks Nature's Lore 33%inclusion 2%synergy 974 decks 2.92K decks Farseek 33%inclusion -3%synergy 958 decks 2.92K decks Bushwhack 30%inclusion 27%synergy 871 decks 2.92K decks Blasphemous Act 26%inclusion -7%synergy 181 decks 691 decks Swarmyard Massacre 26%inclusion 25%synergy 688 decks 2.64K decks Three Visits 25%inclusion 0%synergy 717 decks 2.92K decks Roar of Challenge 22%inclusion 22%synergy 656 decks 2.92K decks Spider Food 22%inclusion 21%synergy 638 decks 2.92K decks Kindred Dominance 22%inclusion 18%synergy 575 decks 2.64K decks Romantic Rendezvous 21%inclusion 21%synergy 129 decks 602 decks Harmonize 16%inclusion 8%synergy 457 decks 2.92K decks Kapow

What makes it interesting is that for just 1 mere life, you can return it to your hand from the graveyard and cast it again to surveil once more
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owners control with a -1/-1 counter on it.) Illustrated by Jeff Easley Standard Not Legal Alchemy Not Legal Pioneer Not Legal Historic Not Legal Modern Legal Brawl Not Legal Legacy Legal Comp