If you take extra turns or have multiple combat steps, you can definitely steal a few good options from opponents
x1] [When Attacking] If your Leader is [Nefeltari Vivi], give up to 1 of your opponent's Characters 3000 power during this turn
Colossus of AkrosColossus of Akros can give you a squadron of flying indestructible defender 1/1 Spirits, with an option to pay ten mana per Spirit to put ten +1/+1 counters on it and turn 'defender' into 'trample.' Seems like a good defensive option while we wait for something else to happen
Look through a Vintage lens, blue and black have a ton of value
Shadow the Hedgehog and Shadow the Hedgehog look like ideal Commanders for aggro or burn decks, while Knuckles the Echidna flat-out adds a new win condition to the game
For only one blue mana, this creature card gives itself a +1/+1 counter until the end of turn whenever its controller casts a noncreature spell