4/4s are nothing to take lightly either, especially when the commander gives them trample as a static effect
If your combo involves infinite deaths, Bastion of Remembrance, Sephiroth, Fabled SOLDIER / Sephiroth, One-Winged Angel, or Ninja Teen are enough to finish the game
One or two more effects like this and Crucible of Worlds will be totally irrelevant
Additionally, for those looking to find rules in a fully interactive environment, let me suggest you check out both the Rules FAQ section and the Rules Q&A section of our forums
Its power grows with the number of creatures in all graveyards, and it even forces everyone to discard on upkeephelping itself and your strategy
I think this card hasn't seen a reprint because it's too strong