Djeru's Resolve
Instant
Untap target creature. Prevent all damage that would be dealt to it this turn.
Cycling 
(, Discard this card: Draw a card.)
Kieran Yanner
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)
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)