为 历时挖掘 寻找最佳的先驱套牌，包括其胜率、热度，以及该牌在万智牌：竞技场中的合法赛制！
Delve (Each card you exile from your graveyard while casting this spell pays for .)
Look at the top seven cards of your library. Put two of them into your hand and the rest on the bottom of your library in any order.
