OKay, now in the last thread I talked about graceful charity... this time im gonna talk about change of heart.. lets look at the mechanics of this card
Okay, the cost is to target 1 monster your opponnen controls in return you can take control of 1 monster.... doesnt really seem like that big of a cost.
Now lets say your opponnent has 5 very powerful monsters on their side of the field.....
clearly it looks like they have the advantage.
Now its your turn, you draw change of heart and you have no monsters on your side of the field.... you activate change of heart and take control of their monster without effort.
For the sake of this explanation, lets say I took control of their exciton and nuke the field... then i just sacrifice it to summon a strong monster for further insult and end my turn.
So in summary with just one card I manage to destroy all my opponnents cards on their side of the field and with little cost at that....
Do you see why change of heart is truly forbidden?