簡單的說，進場效應算是ability的一種嗎?
遺忘輪卡牌的官方註解有提到:
10/1/2007: If Oblivion Ring leaves the battlefield before its first ability has resolved, its second ability will trigger and do nothing. Then its first ability will resolve and exile the targeted nonland permanent forever.
看起來進場效應或離場效應也算是ability的一種?
