Savage Beating
Instant
Cast this spell only during combat on your turn.
Choose one —
• Creatures you control gain double strike until end of turn.
• Untap all creatures you control. After this phase, there is an additional combat phase.
Entwine 
(Choose both if you pay the entwine cost.)
イラスト：
Commander Masters#548神話レア英語適正
裁定
2004年12月1日
The additional combat phase is directly after the combat phase in which Savage Beating is cast. There isn’t a main phase between the two combat phases.