You can spend countless hours improving your knowledge, even as a veteran planeswalker looking up cards, reading about combos, pondering the possibilities of your deck
For example, the deck includes both Merfolk Skydiver and Evolution Sage because proliferate is obviously great with +1/+1 counters
It had a brief window of heavy play for a couple years, and still sees sparse Constructed play in decks with multicolor mana bases
Use Goblin Bombardment to turn those goblins into direct damage
A few months later, a Korean-based seller was relisting a foil Korean Purphoros for $80 multiple times and no one bought it
5 Feldon of the Third Path, Worldgorger Dragon, Illusionist's Bracers, and Anger Infinite flicker