Or things that can be gifted without losing their function, like an Oblivion Ring (unless they can sacrifice enchantments, of course!)
(2/9/2017) Tapping an artifact won't cause its abilities to stop applying unless those abilities say so
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Frenzied Saddlebrute Frenzied Saddlebrute has some very interesting wording: All creatures may attack your opponents and their planeswalkers as though they had haste