For seven mana you get an on curve 7/7 with four powerful keywords - flying (evasion), vigilance (very strong in multiplayer swinging at people in the air for Commander Damage and then holding the fort), deathtouch (no one wants to block) lifelink (nice double life swing for that 7 damage.)
After reading that, one can debate that Roots of Yggdrasil is better than Fields of Camlann
these enhancements can range from unlocking all cards to removing deck cost limit, forbidden card limit, capsule power-ups, and unlimited star chips
Its a bit hard to overlook the fact that we just got another enchantment-based precon with the Commander Masters Enduring Enchantments , and Virtue and Valor isnt really that different from the Adaptive Enchantment precon from Commander 2018 or even the Aura of Courage deck from Forgotten Realms Commander
Remember, your hand is going to consist of seven cards at the start of the game, and if your plan is to spend one of those ramping to get to a four-mana turn three, then you really want to be spending all that mana every turn to get the most value out of that card