To determine the total cost of a spell, start with the mana cost or alternative cost you're paying (such as a flashback cost), add any cost increases (such as kicker costs), then apply any cost reductions (such as that of The Earth Crystal's first ability)
Compared to [[Phyrexian Arena]], this is harder to use but the ceiling is much higher
If your friend has recently started playing MTG Arena, there are lots of promo MTGA codes that can be used for additional rewards
Choose a Background (You can have a Background as a second commander.) Choose a Background (You can have a Background as a second commander.) Legendary Creature - Warrior Gith Toolbox (CTRL to add secondary) You shall not pass
If you like what the deck does or you like the commander, Id say get the deck, but not for an over-the-top price tag
It also works well with cards like Darksteel Reactor while protecting itself