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Tyrant of Discord
Creature — Elemental
When this creature enters, target opponent chooses a permanent they control at random and sacrifices it. If a nonland permanent is sacrificed this way, repeat this process.
Rulings (4)
If the target opponent can't sacrifice permanents (perhaps because of Sigarda, Host of Herons), the opponent will choose a permanent at random but not sacrifice it. The ability will then finish resolving.
May 1, 2012
Repeating the process does not include targeting an opponent. Only one opponent will have to sacrifice permanents.
May 1, 2012
Repeating the process includes the instruction to repeat the process. That is, the opponent will keep sacrificing permanents until they sacrifice a land.
May 1, 2012
Legality
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