Mind Flip

Whenever a player gains life, they instead take X damage, where X is the life that would be gained
Whenever a player takes damage, they instead gain
X life, where X is the damage that would be taken
At the beginning of every upkeep, switch the power
and toughness of all creatures on the battlefield
Whenever a player casts a spell, they may have it
deal 1 damage to any target
Whenever a player cast a spell other than Mind
Flip, any player may counter that for {x}, where X is
that spell's converted