Tournament rule 509.5.a.1 Example
Example: A player exhausts two runes and plays Pouty Poro from hand to their base, then immediately decides they do not want to play it. They may return it to their hand and ready those two runes.
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Example: A player exhausts two runes and plays Pouty Poro from hand to their base, then immediately decides they do not want to play it. They may return it to their hand and ready those two runes.