Many of the cards he suggested are rather imbalanced. Not that they're bad ideas, but it looks like he needs more experience with the game to understand how such powerful additions as these would upset the balance.
For those who weren't around then, we used to have Quick 0-cost cards with positive effect. The result of this was that everyone was encouraged to have these cards in every deck as it was no different from replacing a Common slot with an increased chance to draw an Uncommon (or if you go back further, Rare). It is not in anyone's interest to encourage necessary similarities in everyone's decks. To fix this, Quick Commons were given costs and/or negative effect, and ultimately most were reworked to no longer be Quick.
Luck, as proposed, would not only recreate the initial problem (EVERY deck would have it), but it's starkly more advantageous than any of the Quick 0-cost that were necessarily nerfed.