Additionally, decks with their own alternate win conditon, like combo decks or Toxic strategies that win by giving players poison counters, can be less vulnerable to Exile effects by including more instants and sorceries and fewer permanents
As a green creature, it can be very powerful, especially with lands-matter commanders or landfall commanders that run a higher-than-average number of lands
Theres really no downside here
The Lesson searching Arcane Subtraction will help you win a normal combat trade
The general rule of thumb is that a cards raw value should be at least 23x the cost of the grading service before it makes financial sense to submit
Vivi can be hard to keep in play due to his notoriety (he did terrible things in Standard) but on the bright side, his mana cost is so low that it shouldn't be too hard to bring him back