what are the most powerful cards in the game

I have yet to use a duel with this strategy.
I have the most powerful monsters that don't need a tribute :
Gemini elf atk 1900
Vorse raider atk 1900
Mechanical chaser atk 1850
Harpies brother atk 1800
7 colored fish atk 1800
Dunames dark witch atk 1800
La jinn the mystical genie of the lamp atk 1800
Neo the magic swordsman atk 1700
Battle ox atk 1700
I also have mags vailo he is a very good duel monster if you equip him with any atk or defense boost the effect is doubled, I have gotten his atk to 3550 multiple times. I also have cyber Stein his effect costs you 5000 life points but it lets you summon any fusion type monster (blue eyes ultimate Dragon) for example. I also have summoned skull atk 2500 that only needs one tribute and cyber tech alligator with 2500 atk as well. Throw in some powerful magic and trap cards such as trap hole, raigeki, monster reborn , waboku for example and you have yourself an almost unstoppable deck. I also have a few monsters with low atk and defense but they serve their purpose by being able to take out other monsters with their flip ability. Man-water bug, wall of illusion, penguin soldier and cyber jar all have the ability to f the opponents monsters up without even attacking. There ya go