The Evolution of Fire in YGO Duel Monsters

Episode 14:

Two-tone crayon fire

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Episode 15:

Abruptly higher-quality fire

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Episode 36:

Fire is slightly transparent now

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Episode 45:

Virtual reality fire comes in two flavours; ground flavour and moth flavour

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Episode 51:

Ahh! A fire!

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Episode 65:

Unclear if fire or not?

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Episode 71:

Weird clashing-animation-style billowing fire.

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Bonus! Episode 69:

Magic homosexual fire

(to be continued)