This card is not usable, but its associated line is still in the Sound Test.
Like most Pokmon cards, the value of Onix depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (HSUnleashed)
When your commander is capable of drawing cards for you, this limits the need to include multiple sources of card advantage in your deck
Update April 18th, 2023: This list of banned and restricted cards has been expanded once again with new entries from similar Lists to show everyone all of Magic's banned and restricted cards in a single, definitive list
Simic commanders only know land drop, value, and take game action." All of this is true
Creatures (19) 2 Hidden Dragonslayer 4 Den Protector 4 Deathmist Raptor 2 Nissa, Vastwood Seer 4 Hangarback Walker 3 Archangel Avacyn Planeswalkers (4) Lands (25) Spells (12) G/W Megamorph served me well at the beginning of Battle Standard, and, with no major losses, it looks like a fine place to start with this format as well