PC Online beginners should start with a basic deck to learn the game mechanics before experimenting with more complex strategies
March of the Machine: The Aftermath boosters will start pulling rares/mythics from March of the Machine after completing every rare/mythic from Aftermath
Ink batches differ and will give different tonal changes depending upon the manufacturer
The gold comes up mainly in the context of price and pull-rate discussion as the set's toughest and most expensive card, alongside broader fatigue with the run of small single-headliner sets
Most recently, aoki contributed a Mismagius Illustration Rare to Japan's Triplet Beat, which will likely show up in Scarlet & Violet Paldea Evolved
For the low, low cost of one card, you get to attack again, draw a card, and use all of your mana a second time, plus get a crack at additional upkeep/end step triggered abilities and all that good stuff