Breaching Leviathan
Creature — Leviathan
When this creature enters, if you cast it from your hand, tap all nonblue creatures. Those creatures don't untap during their controllers' next untap steps.
These waters remain uncharted, but not for lack of trying.
Tomasz Jedruszek
Commander 2014 (C14)
• #12Rulings
The triggered ability affects all nonblue creatures, including those you control.
(wotc • 2014-11-07)
The triggered ability tracks the creatures, but not their controllers. If any of the creatures changes controllers before its original controller’s next untap step has come around, that creature won’t untap during its new controller’s next untap step.
(wotc • 2014-11-07)
Rulings
The triggered ability affects all nonblue creatures, including those you control.
(wotc • 2014-11-07)
The triggered ability tracks the creatures, but not their controllers. If any of the creatures changes controllers before its original controller’s next untap step has come around, that creature won’t untap during its new controller’s next untap step.
(wotc • 2014-11-07)