Can the “Minor Illusion” cantrip or “Silent Image” spell be used to emulate the casting of other spells?
Thus hopefully tricking another spell caster into wasting a 3rd lvl or higher spell slot to cast “Counterspell” or “Dispel”?
If you have played any spellcaster capable of casting Counterspell you know every time someone announces what spell they are casting like a well placed “Fireball” you or your foe jumps right up screaming “Counterspell”. So far I have seen no one describe the visual appearance of the casting of a spell any spell other than a DM before/after announcing the spell´s name and level.
I’m specifically thinking of using the cantrip to emulate the casting of a different spell, not the effect. Just enough of a deception attempt to look like a spell is starting to complete casting, to make another spellcaster react.
A ball of fire to emulate Fireball or a similar imagery like a bright glow at the tip of the PCs pointing finger to emulate the casting of said spell or even “Delayed Fireblast Fireball”.
Covering yourself in illusory flames to emulate “Investiture of Flame”.
Making your hand glow brightly to emulate “Sunbeam”.
A levitating disk of light to emulate “Portal”
I expect that in most of these cases an opposed or contested ability check would be required from one or both spell casters.
At a 60ft distance (maximum range for Counterspell) you would not hear the verbal incantations nor see the somatic movements very clearly if at all. So, the best indication would be any visible change like a glowing hand or finger. “Minor Illusion” only has a Vocal and a Material (a bit of fleece). “Fireball” (for example) has a Vocal (that would not be easy to heard), the Material (tiny ball of sulfur or bat guano) would be in your closed hand/fist (unable to be seen), and the Somatic component could be made mockingly or completely improvised. So, by making your finger glow, you could fool another spellcaster into thinking you are casting “Fireball”.