The fact that it was released almost a year before the official release of the TCG has given this card a reputation and a specific market: many people wanted to get their hands on a Lorcana card in advance
If your collection is very high value, or contains high value cards such as Power 9, dual lands, Reserved List cards, serialized cards, etc., you should contact a vendor such as AncestralMTG that specializes in high end cards and collections
Phyrexian Arena Rarity: Rare TYPE: Enchantment SUBTYPE: - CMC: 3 Mana cost: USD: $4.06 EUR: 2.79 TIX: 0.02 EDHREC RANK: 100 At the beginning of your upkeep, you draw a card and you lose 1 life
It may look cuddly, but this rabbits hiding a suite of infinite combos up their sleeves, in their hat, and pretty much everywhere
For one blue, one green, and three colorless mana, you get a 6/6 reach, trample, and indestructible creature that can't attack or block if it doesn't have an even amount of counters
Plenty of players still run a colorless commander like Karn, Silver Golem or Traxos, Scourge of Kroog, but having mana sources matters even more with artifacts-matter partner commanders in all colors like my favorite, Keskit, the Flesh Sculptor, and commanders in three or more colors like Sharuum the Hegemon