Knowledge Pool
In Brief: The Knowledge Pool variant is an additional set of rules that can be overlaid onto other ways to play. Simply play as though an ethereal, invulnerable copy of Knowledge Pool was in play from the very start of the game.
Rules Rundown: I'd suggest that you check Noel's articles linked above to get some clarification on the rules intricacies of our favorite spell-interacting artifact. For starting a game, players should draw their opening hands, then resolve any desired mulligans, before exiling the top three cards of their library for a Knowledge Pool that sits, invulnerable, in the command zone.
As far as actual game play is concerned, adding the Knowledge Pool to your favorite multiplayer formats (like Commander and Two-Headed Giant) is a particularly keen way to get the action going. For those of you interested in maximizing the level of awesome it can provide, I'd recommend a putting together a Stack that focuses on the following:
Creatures with flash and "enters the battlefield" triggered abilities
Instants and sorceries with several modes (like Esper Charm or spells with entwine)
Effects that let players draw extra cards (like Rites of Flourishing and Howling Mine)
Spells with kicker and other scaling potential
Whatever your way to play with multiple players is, the odds are that adding Knowledge Pool will shake things up a bit!
Pros: You get to use your everyone's stuff! Switching and swapping spells in and out is a real game-changer, and with more players come more levels of interaction. And for the social/political gamers out there, recall that when a player leaves a multiplayer game, all cards he or she owns cease to exist.
Cons: Other people will use your stuff. Sometimes we don't always want to share the things we bring, and knowing we're playing with the Knowledge Pool puts a real temptation to switch out "the good stuff" before going in.
Knowledge Pool is also a little confusing in some cases. Getting everyone up to speed on how things need to work, especially in the chaotic world of four or more players, is a boring but probably requisite task. If you're not interested at all in rules curiosities and the stacking of triggered abilities, then you're probably not going to enjoy taking a dip into the Pool.
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