Kara, Distortiomancer

Devoid (This card has no color.)
Warp (At the beginning of your upkeep, switch this creature's power and toughness.)
Whenever Kara, Distortiomancer deals combat damage to a player, put a distortion counter on target creature that player controls.
{w/u}: Switch the power and toughness of target creature with a distortion counter on it.