Magic: The Gathering
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Can I cast instants on my opponent's turn, such as before they declare attackers?
The rulebook states this directly, and forum answers agree.
- Magic: The Gathering rulebook · Rulebook · Card Types
- fizzmore · Community · 2013-10-15
- scifiantihero · Community · 2013-10-15
Yes. Any time you hold priority, in their upkeep, draw step, main phase or beginning of combat, you can cast an instant. Online clients may require you to set stops to get those windows.