This Legendary planeswalker card, Dungeon Master, would benefit a control deck that focuses on stalling the game and gaining incremental advantages over time
For one, Fiery Emancipation increases your damage output potential by a staggering 100% over its predecessor, letting you triple the damage of anything you dish out
If a player is unhappy with their hand, they may take a MULLIGAN
Premier sets have been infiltrated, for instance, and Legendary Creatures are no longer as legendary as before
I don't think I knew any legitimate strategy back then so as far as I can recall my deck had like 3 or 4 types of energy clogging it up, which I suppose is the equivalent of the classic '4 Fire moves on Charizard' syndrome
As for the abuse, I'm not sure it's really possible to believe that it won't happen, especially with people buying Happy Meals just for the cards, all the waste, and so on