For six, your Commanders now have a power and toughness of 10 each, nasty for the game-winning

As promos from the above table expire, they will then be moved here: PlayAlchemyNewCapenna ObscuraConnive RiveteerBlitz CabarettiAlliance MaestroCasualty BrokerShield PlaySNC PlayNEO FNMATHOME AlwaysFinishTheJob PlayTheros PlayIkoria PlayM21 PlayZendikar PlayKaldheim PlayStrixhaven PlayMID PLAYVOW InformationIsPower CrimeIsAnArtForm FunIsntFree PlayNEOAlchemy FNMATHOME Mellon ReadTheFinePrint RepairAndRecharge EnlightenMe WrittenInStone ShieldsUp InnerDemon OverTheMoon SparkleDruid ShinyGoblinPirate FoilFungus ParallaxPotion SuperScry LevelUp ReadTheFinePrint RockJocks ArtClub SwampPunks MathWhizzes TryKaladesh DebateDuelists COURIERBAT CIRCUITMENDER BingoIVMythicChamp BORROWEDTIME BroughtBack Crumbelina DelightfulMeadow ExperimentalOverload FiveBonusLevels FoodCourt GAMEKNIGHTS GOLDENCOMMUNITY HappySwamp IslandWilderness MoveMountains MythicMagic OneBillion PARCELMYR PlayAllegiance RestorativeBurst SCALEUP StarterStyles ThatsWild TisAScratch TreeFriend ZendikarLands What are Magic The Gathering Arena codes used for

For counters, it doesn't matter who put the counters on the creature or what kind of counters they are
You can now schedule your Two-Headed Giant Commander Night events in Wizards EventLink
Is a Saga Considered Legendary
Finally, you can play lands commanders like The Gitrog Monster or Titania, Protector of Argoth that can benefit from lands going to the graveyard, be it one or all of them