Dimension Magic

[Hiro-Sakano]

Just one question... is the effect of destroying a monster on the field mandatory? just to be sure, i think it is.

[yamicell2501]

Dimensional Magic
Magic - Quickplay
This card can be activate if you have a face-up Spellcaster sub-type monster on your field. Sacrifice one monster on your field, special summon a Spellcaster sub-type monster from your hand. Afterward, you may destroy a monster on the field.
(from Spike and Baron's Duel Monster Comet)

It's optional to destory a monster by this effect.

[Astrael]

The effect is optional. Which is good. Because you don't want to use it if you play DMoC. Since it will cancel out his mad graverobbing skillz.

[wingzrow]

why is that?

[ka1z0ku]

Effect = optional.

[kenshinEtErNaL]

why is that?

It would kill DMoC (therefore RFGing him) as soon as he hit the field. If it was mandatory.

[Vampirelord64]

dimension=optional :)

[Hiro-Sakano]

The effect is optional. Which is good. Because you don't want to use it if you play DMoC. Since it will cancel out his mad graverobbing skillz.
Why people assume that I would be worried of Chaos Black Magician?, what about Chaos Magician, Black Magician Girl, Black Magician, Cosmo Queen, etc...?