In the battle between Absorb and other three-mana counters Absorb would almost always win out if it was easily castable, and it was even a small incentive to choose white over black as a secondary color
Trigger Discard (sample: Bottomless Pit) I play a permanent that causes one of the above discard effects to trigger whenever situation X happens
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You may lose it after two turns, but it at least replaces itself with a free card or two and dominates the board while its in play
Characters like Shadow, Mysterious Assassin
For example, Jacked Rabbit creates 1/1 white Rabbits equal to its power everytime it attacks and if you happen to have used Offspring on Jacked Rabbit as you cast it, your Offspring will create an additional white Rabbit token every time either one of them attacks