Both it and Mondrak come in at a respectable four mana, making them both more reliable early-game value engines than Ojer Taq
If you've collected all the rares and/or mythic rares in the set, the card will be replaced with Gems: 20 Gems for rares, 40 Gems for mythic rares
The most famous example is the easy infinite Zirda has with either Basalt Monolith or Grim Monolith untapping a Monolith isnt a mana ability, it just happens to control how often we can use the attached mana ability
Radiant, Serra Archangel isn't bad, or Ravos, Soultender for some graveyard recursion
As for how this all relates to your commander, each colored mana symbol that appears on a card in your deck must also appear on your commander
Caring about the mana value of spells is a theme that runs in opposition to traditional Spellslinger strategies that want to chain together cheap, low-cost, and efficient instant and sorcery spells, and consistent token generation gives the deck a more impactful board presence to fend off attacks