What is the most powerful Magic the Gathering card?

There is not just one most powerful card. Throughout the magic years there have been 9 cards that surface as the most powerful and the most feared. They were all printed in Alpha and I really Really hate them (just because I dont have them)

the Power 9 are:

Mox Jet

Mox Sapphire

Mox Ruby

Mox Emerald

Mox Pearl

Black Lotus

Ancestral Recall

Time Twister

Time Walk

These cards are worth hundreds of dollars a piece

Answer

The 'power nine' are notably more powerful then nearly anything that came after. However the card 'Black Lotus' is generally considered to be the most powerful.