Sarkhan, Fireblood There are a few good things that any 3-drop planeswalker wants to bring to the table
This commander plays much better if you use the mana reduction to make 2-3 mana interaction spells cost a single mana rather than getting a discount on bigger cards like Breach the Multiverse
When you have a clear idea of how to win, this card can feel unbeatable
Let's see how well the stock list pulls off its goals: Counter Blitz is all-in on Counters and does what it sets out to do well: I count 38 cards the put counters on either themselves or other cards, nearly all of these are +1/+1 counters but there's a bit of other stuff too (4 summon creatures put lore counters on themselves like Summon: Valefor)
For this example, though, I will assume I still do not know what Commander to choose
Its unfortunately also one of the most expensive with just a set of Mox Diamonds likely to set you back about $2,400 and a single copy of The Tabernacle at Pendrell Vale hovering around the $3,000 mark