Its been impactful in many formats, to the point that playing 20 more cards in your deck just to get the companion mechanic going seems like a good idea (sorry Commander players, you cant have a 120 card-deck)
The Commander decks revealed for Magic: The Gathering Final Fantasy are as follows: Scions and Spellcraft For the MMO lovers, Scions and Spellcraft is a Final Fantasy XIV-themed deck that places Yshtola, Nights Blessed in the Command zone
When the ability tries to resolve, if the number of attacking creatures is no longer greater than the number of quest counters on ED-E, it won't resolve, and you won't put a quest counter on ED-E
Even just the freedom to call off a combo attempt in the face of interaction or fizzling and conserve any remaining mana for a future re-attempt is a huge shift in the paradigm for these archetypes
It has unearth for two green mana to bring it back once out of nowhere
Both of those cards will untap any permanent I play that would normally enter tapped