What it does
Radiance is a targeting mechanic from the original Ravnica block, found on Boros spells like Wojek Siren and Sunhome Enforcer's guildmates. When you cast a Radiance spell, you choose a target creature, then the effect applies to that creature and every other creature that shares a color with it. So if you target a white creature, all white creatures (yours and your opponents') get hit.
The biggest misunderstanding: Radiance isn't optional or limited to your own creatures—it affects all creatures sharing a color, including the targeted one and your opponents' stuff. Multicolored creatures count for each of their colors, so targeting a Boros (red-white) creature catches everything red or white. Colorless creatures are only affected if you target one directly (and then only other colorless ones).
In Commander, it's a niche but symmetrical effect—great for color-skewed boards, risky in rainbow metas where you'll buff or damage opponents too. Read the spell carefully before committing.
Iconic cards with Radiance
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