There are several types of starter decks, all at different price points, so these will be ranked based on the following criteria: price, strength out of the box, and ease of upgrades
Traditionally, we would have monthly and quarterly events at local game stores playing with actual cards
"Hi-Speedroid Chanbara" which can attack twice, gaining a smal amount of ATK each time and add a banished "Speedroid" monster to the hand if sent to the GY, "Hi-Speedroid Puzzle" can recur a "Speedroid" monster from the GY at the end of the turn it is sent to the GY
The most valuable Darkness Ablaze card is Kabu [Professor Program] #186, currently worth about $750 raw
Conclusion Depending on what you're up against, there may be some cost-effective cards that drastically improve your chances when sitting across from competitive Commander decks