In addition to the obvious things like Syphon cards (do some effect to each other player, gain benefits depending on how many other players this hit), there are cards that affect a random opponent, cards that give everyone the game the ability to join forces to create a big effect (for example, a sorcery that lets everyone pitch in mana and then lets everyone put lands into play from their decks), and Enchant Creature cards sorry Auras that boost the creature while preventing it from attacking to
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It doesn't matter if they were creatures when they entered or who controlled them when they entered
Given enough time Call for UnityCall for Unity can become a big problem since this deck easily triggers the revolt
A good Kianne deck would have a better mix of creature and non-creature spells and ways to draw cards in order to gain the type of flash you want Kianne to provide at any given moment
Between Sliver Gravemother and Sliver Hivelord, both are acceptable commanders but I gotta give it to the Gravemother: encore is a powerful mechanic and even though the precon isn't really built around it outside of some discard or sacrifice slivers it's still a great way to get more value out of your deck, and the buildaround potential is huge