Rule of 5000

The "Rule of 5000" is a general rule that few monster cards have an original ATK or DEF equal to 5000. There are only two monster cards in the TCG/OCG with and original ATK and DEF equal to 5000. Those monster cards are Dragon Master Knight and Five Headed Dragon. Those that do typically have Special Conditions for being Summoned, to limit the cards.

If you are creating a powerful card, it may not necessary need a high ATK or DEF. Try play testing it with lower ATK/DEF power.