Invest in PSA Grading : Have particularly rare Shiny cards professionally graded to ensure their value
The sheer amount of mana generation and free spells Urza lets you cast can get obscene, and can easily enable a ton of infinite combos to win the game in one turn
Think of all the times your Commander pod has joined forces against you
This is better than the Mirage cycle, but doesn't do much to encourage you to play them on your turn, especially if you have the mana
It retains Claw Slash from its Charizard V form, though now with an added 20 damage
Mirrodin (20042005) Skullclamp was, quite simply, a mistake, and even with the best intentions and design practices, mistakes will happen (especially when dealing with new card types, like equipment in Mirrodin block and perhaps Vehicles in Kaladesh )