"If Tarle the Thrice-Drowned has 3 power on him, discard him from play."
If you succeed to have Tarle with 4 powers on him for some reasons (let's say he's got already 2 powers on him and is lord during a plot phase with Red Wedding and fortified position). Is he discarded from game ? I suppose no, because it doesn't say "3 powers or more on him". Is it a miswording ?