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Whenever Samite Herbalist becomes tapped, you gain 1 life and scry 1. (Look at the top card of your library. You may put that card on the bottom of your library.)
If Samite Herbalist becomes tapped while casting a spell or activating an ability, that spell or ability resolves after Samite Herbalist’s triggered ability has resolved.
Samite Herbalist’s ability is a triggered ability, not an activated ability. It doesn’t allow you to tap it whenever you want; rather, you need some other way of tapping it, such as by attacking.
