Simple answer: yes, yes you can play more than the minimum deck size
Here are the best methods: Check Online Marketplaces Websites like eBay, TCGPlayer, and Cardmarket are great for checking real-time prices
Snow White, Unexpected Houseguest can get the ball rolling on playing these dwarfs with her ability How Do You Do?, which makes every dwarf card cost one fewer ink to play
A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
While they know they can sell some of the items, they've also opened a few of the boxes
Enchantment Color tag templates(None) Chasm Skulker Whenever you draw a card, put a +1/+1 counter on this creature