As the figures go down the staircase to their doom, they also could easily avoid it, and yet Well, they don't
Golgari (green-black) is a close second, adding removal and graveyard recursion
The fact that it only ticked up, created game objects that could trade up for life points or be turned into threats, on top of invalidating your opponents entire strategy, made it one of the most reviled cards ever printed
For example, if Liliana's Undead Minion enters the battlefield during combat, there will be an opportunity for your opponents to remove it before you can activate one of its abilities
This was a huge problem with the black cards, as those commonly saw themes related to death and bloodshed