Political Interdependence

(This enters the battlefield when the game begins and cannot be destroyed or removed. There may be no outside alliances and this cannot be played with teams. Can be played with Planechase.)
Players may assist with mana cost on other player's spells, block another player's creatures from damage, cast spells to prevent a negative effect for another player, give any amount of life except their entire life total, give creatures to a player if the receiving player has less creatures.