Getting resources is fun. Helping everyone get resources is fun. Teaming is fun. Ruining peoples' day is fun.

Strategy

This deck embraces group hugging, but you hug a little too tightly. Play from a number of helpful walls - Flumph gives cards and Wall of Shards give life. Your Axebane Guardian and Overgrown Battlement provide a substantial source of mana to further help you and other players. Then, you can cooperate with certain players by copying their sorceries and instants via Wandering Archaic, or just tax them.

The truth is, however, that this deck aims to win. Spiteful Visions may seem like a weird inclusion, but there needs to be a red and black card for the Happily Ever After win condition. Alternatively, just drawing your opponents to death with Folio of Fancies works, and even that opens the opportunity to win with mill.

Sideboard Options

I include The Wanderer in the deck for Happily Ever After and Spiteful Visions, but Huatli, the Sun's Heart is also great for defence.
Rites of Flourishing and Heartbeat of Spring are great if you want to ramp everyone without regard for your win conditions.
Winds of Abandon can reset the game and bring someone struggling in lands back into it.
Axis of Mortality is there for performing a reversal on opponents after they have 60+ life from Wall of Shards.
Try Spore Frog for infinite fogs with Kenrith, the Returned King.