Board control
Old school magic.... has board control. The cards that effected this the most are "Royal Assasin", "Time Elemental", "Temporal Adept", and even in later sets... "Isochron Scepter" with a "boomerang" or "Swords to Plowshares" on it... or even a "Twiddle" to tap or untap the creatures on the board for repeat use.
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Irza#80909 commented
Blue/ White counter kill with "bounce" ability is still one of the most consistent and full proof decks. Thus the super ability of "Shroud" being so cool. Carnage Tyrant is one awesome sauce card.