With the cohesion that the Seven Dwarfs offer each other and the various buffs from items, it can be a challenging deck to master but very effective
It only works with instants and sorceries, but you have double magecraft/prowess abilities
You cant really go wrong with it, assuming you like artifacts and counters
Related Article: How to play Disney Lorcana Ultimately, to balance the card there has to be a drawback to it, and in this case its 2/3 means that its easily removed from the game by opponents who will likely want to target it for the very reason that its such a good card
A keepable hand is also subjective, but well assume we only wish to keep hands with between two and four mana sources
The Aura + Venture is going to be good enough for that, and then the completed dungeon bonus makes this far more potent