Also, beware of Mardu Siegebreaker: Its a really good card, but you wont want to exile a mobilize creature with it
Morpho Butterspy X DARK Level 4 [ Warrior / Effect ] ATK 1200 DEF 1600 Once per turn, when the battle position of an opponent's monster(s) is changed (except during the Damage Step): You can target one of those monsters
This was mainly used in True Draco, a Deck that only used their effects mainly on the opponent's turn, when Amano-lwato was back in the hand
(2) The other pro is that giving your opponents more cards in situations where one of your opponents is in the lead makes it much easier for the table to gang up on them and set them back, and in situations where you're in the lead you can simply choose not to ring the bell just to maintain your advantage
Mishra wouldn't show up as a normal card until years later in Time Spiral when he finally got a legendary creature card
Of course, look at the buylist price of that card relative to the next two