Disc Fighter

 This monster's effect to instantly destroy Defense Position monsters of at least 2000 DEF is fitting, considering that 2000 would be the sum of this card's ATK and DEF (1000 + 1000 = 2000).

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OCG Rulings

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The effect of "Disc Fighter" is a Trigger Effect. (It does not target.): Disc Fighter

The effect activates before damage calculation.

Even if it attacked a face-down Defense Position monster, the effect activates after that monster is flipped face-up.

If "Disc Fighter" attacked a face-down Defense Position Flip monster

Previously Official Rulings

You destroy a monster with "Disc Fighter's" effect during the "calculate damage" portion but before the "apply damage" portion of Damage Calculation; which effectively means it's right before the actual "Damage Calculation".As per the latest , there are not separate "calculate damage" and "apply damage" portions of damage calculation. This effect actually activates at the "before damage calculation" timing, as the second half of the ruling clarifies.

When "Disc Fighter" attacks a face-down monster, after it is flipped face-up you can use "Micro Ray" to cause the DEF to go below 2000, and the monster will not be destroyed by "Disc Fighter's" effect. Or, you can use "The Reliable Guardian" to increase the DEF of a monster above 2000 so that it will be destroyed with "Disc Fighter's" effect.

The Defense Position monster is destroyed by "Disc Fighter's" effect, not by damage calculation or "as a result of battle".

If "Final Attack Orders" is active, a monster attacked by "Disc Fighter" and flipped face-up will shift to Attack Position, so it will not be destroyed by "Disc Fighter's" effect.