Especially strong in decks that favor combat focused Commanders like Aurelia, the Warleader, this counterspell can save your Commander, her Sword of Feast and Famine, or the Aggravated Assault thats terrifying the table
Farewell is possibly the best boardwipe in the whole of commander, with its versatility and ability to exile (not destroy, importantly) whatever you need at that moment while protecting the other types you want to keep around
(Some abilities can also target unexerted cards.) But not using them has less of a direct benefit - you dont need to defend your life points, as in MTG or Yu-Gi-Oh!, so leaving cards upright is typically only worthwhile if theyre likely to be challenged by your opponent and you need them for a future turn
Sure, this Merfolk is frail at 1/1 with no protection, but once you toss down a few lords and boost this creature's power and toughness to hefty heights, you're drawing beaucoup cards per turn
Suspecting a new creature doesn't cause other creatures to stop being suspected