Due to being the big bad from Jurassic World and being a top 20 Dinosaur commander option per EDHREC, its no surprise to see it top this list with a market price above a cool $1k
While its plenty powerful, its the effect on perceived barrier-to-entry that really posed a problem because casual players watching Commander games in passing could reasonably assume that they needed hundreds (now thousands) of dollars in Power-9 mana as table stakes, just to join the format
This can trigger when you make Treasure tokens too, which is very easy to do with very little effort in formats like Commander
In standard mode the player's deck can only use cards which are legal in the current standard rotation (each year older cards are retired from play)
For example, discover 3 would allow you to play either Promise of Aclazotz or Foul Rebirth, but not both
+1/+1 counters synergy : 21 cards Benthic Biomancer, Deeproot Elite, Forerunner of the Heralds, Herald of Secret Streams, Tributary Instructor, Zegana, Utopian Speaker, Prime Speaker Zegana, Ripples of Potential, Inspiring Call, Quandrix Command, Fuel for the Cause, Wave Goodbye, Hardened Scales, Simic Ascendancy, Bred for the Hunt, Forge of Heroes, Littjara Mirrorlake, Llanowar Reborn, Novijen, Heart of Progress, Oran-Rief, the Vastwood, Nicanzil, Current Conductor As we can see we have a strong presence of +1/+1 counters strategy cards