为 金属头 寻找最佳的标准套牌，包括其胜率、热度，以及该牌在万智牌：竞技场中的合法赛制！
When Metalhead enters, return up to one other target artifact or creature to its owner's hand.
, Sacrifice another artifact: Put a +1/+1 counter on Metalhead. He gains menace and haste until end of turn.
