Not sure if there are other easier avenues to obtain just the Transformers cards, but prepare yourself for a lot of pack ripping if you want to do it the old fashion way
To reiterate, the Standard Regulation is a system that determines eligible cards based on the block icon shown at the bottom right of each card
This black planeswalker is an early-turn play that can often alter your opponents aggressive strategy quickly
Set unplayable cards aside (mostly trash rares, Stolen Uniform, Elixir), then assess which of your colors are deepest
On the other hand, booster packs may provide a higher probability to earn value above their purchase price
Logging and looking these up manually would take a while, so I decided to see if I could automate some of the process