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This rule was also invoked in Duelist Kingdom. Dark Yugi played "Beaver Warrior" in Defense Mode at the end of his turn when his field was empty, having already Summoned "Kuriboh" that turn.
** Each monster can only attack once per turn.<ref name="d 38" /><ref group="note">Generally, the rule that each monster can only attack once per turn is implied, rather than stated outright, as players are never shown to attack with the same monster more than once per turn. It is somewhat stated in {{chapter|Yu-Gi-Oh!|38|ref}} when Dark Yugi says that Kaiba's two "Blue-Eyes White Dragons" can destroy two of his monsters each turn.</ref>
In the Basic and Standard Rules, if a player does not have a monster on their side of the field at the end of the their turn, they can play one from their hand in Defense Mode.<ref name="d 37" /><ref name="d 67" />
During their opponent's turn, a player can:
This is the most basic set of rules and does not feature any of the rules introduced in later rule sets.
===Standard===
