The bolster ability triggers off any of your dragons attacking, so you can stack up counters fast, even if they dont always go where you want them to
Adarkar Valkyrie always makes me chuckle whenever I run across it while deckbuilding
Chris Mooney and Ari Zirulnik assembled lists of characters from every game and split them up into tiers of mandatory, suggested, possible, and backup
Not forgetting of course you still need the equipment aspect too
Being able to finish off the game with what is essentially direct poison damage after the Infect creatures are dealt by opposing removal and sweepers with is a new and potentially powerful line of attack for the archetype, and this doesnt even include the fringe combo potential
This deck doesnt offer such a squeeze, but still she is an all-star