What it does
Flash lets you cast a spell any time you could cast an instant—including on your opponents' turns, in response to other spells, or at the end of someone's turn. It applies to permanents like creatures, artifacts, enchantments, and even planeswalkers, letting you sneak them onto the battlefield without using your main phase.
The most common misunderstanding: Flash only changes timing, not the rules of casting. You still pay the full mana cost and must follow normal restrictions (like sorcery-speed effects on the card itself). It also doesn't grant haste, so a flashed-in creature still has summoning sickness and can't attack or tap immediately.
In Commander, Flash is huge for ambush blocks, dodging sorcery-speed sweepers, and holding up interaction while keeping the option to deploy threats. Flashing creatures during an opponent's end step maximizes information and mana efficiency.
Iconic cards with Flash
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