You may play an Action card from your hand twice. Gain a copy of it.
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When you discard this from play, you may exchange it for a Teacher.
(This is not in the Supply.)
Disciple is an Action-Traveller card from Adventures. It is a Throne Room variant and a gainer. It is not in the Supply, but can be exchanged(exchange) for from a Fugitive. Disciple itself, once discarded from play, can be exchanged for a Teacher. There are only 5 copies of Disciple in the Disciple pile.