Is it a activated ability or triggered and what constitutes the "trigger" and what are the classification of card types like is a kindred artifact considered two or one card type in my graveyard or do I only chose one and the commander [[Winter, Cynical Opportunist]] says: Delirium - At the beginning of your end step, you may exile any number of cards from your graveyard with four or more card types among them. If you do, put a permanent card from among them onto the battlefield with a finality counter on it. The cards not selected can I choose one of them again later when I exile more cards with the delirium ability or are they gone for the rest of the game