Josiah, Ocean Defender

At the beginning of your end step, all players create a Junk token.(It's an artifact with {t}, Sacrifice this artifact: Exile the top card of your library. You may play that card this turn. Activate only as a sorcery.)
Whenever you tap an artifact add {g},{u}, or {r}. Whenever an opponent taps a nontoken artifact they may pay 2 life if they
do not they sacrifice that artifact.