"Before you know it, I'm like Smaug the dragon hoarding the hourglasses." To be clear, Vincent does open packs - he's sitting on a respectable card collection including some sought after crown rarity gold rares, and needs to keep his decks up to date to keep winning challenges - but he never uses hourglasses
So boosting Dark Magician Girl to full power is no problem
If Mega Lopunny ever gets its own card, it would be interesting to see it be a Fighting-type card as it gains this typing when Mega Evolving, making it more unique from other Lopunny cards
In terms of a card to avoid, I would like to point out Ransack
But in recent times, its easier to fire a draft or to find a Commander pod than to play casual or competitive Standard at the LGS, and even Eternal formats like Modern or Legacy see more play due to these formats slower rate of change