Djeru's Resolve
Instant
Untap target creature. Prevent all damage that would be dealt to it this turn.
Cycling 
"When I wish to be strong, I train. When I wish to be wise, I study. When I wish to rest, I start again."
Kieran Yanner
Amonkhet (AKH)
• #11Rulings
Untapping an attacking creature doesn’t remove it from combat.
(wotc • 2017-04-18)
Djeru’s Resolve can target an untapped creature. Its prevention effect will still be applied.
(wotc • 2017-04-18)
Rulings
Untapping an attacking creature doesn’t remove it from combat.
(wotc • 2017-04-18)
Djeru’s Resolve can target an untapped creature. Its prevention effect will still be applied.
(wotc • 2017-04-18)