The cheapest proxy sites will have deals for purchasing large numbers of cards, and offer discounts on specific singles
Fraying Omnipotence brings a new tool to kitchen table gaming, and it feels like a powerful Pox effect
A better value legend is likely just another planeswalker or even Vance's Blasting Cannons
Brineborn Cutthroat is a great card because its cheap, triggers multiple times a turn, and is just good enough when not beefed up
Of course, there are some who just want to collect the cards, but there are also many who are buying just with the intention of reselling them
With the third card Quicksilver, Brash Blur a new mechanic called Power-Up was introduced that functions a bit like Exhaust in that it buffs the creature but can only be used once