Generally, there are only two possible cases for Dramatic Reversal after it's cast:
Either Dramatic Reversal leaves the stack before it resolves (e.g., because it's countered), so that it won't resolve and won't untap any permanents...
Or Dramatic Reversal resolves (in which case it will be on the stack, not in the graveyard), it untaps all nonland permanents "you control", and only afterwards goes to the graveyard (C.R. 608.1, 608.2c, 608.2k).
Generally, there are only two possible cases for Dramatic Reversal after it's cast:
Either Dramatic Reversal leaves the stack before it resolves (e.g., because it's countered), so that it won't resolve and won't untap any permanents...
Or Dramatic Reversal resolves (in which case it will be on the stack, not in the graveyard), it untaps all nonland permanents "you control", and only afterwards goes to the graveyard (C.R. 608.1, 608.2c, 608.2k).
In other words, Dralnu cannot target DR before it resolved (and goes to graveyard). Thanks!
Is it possible to cast DR, tap Dralnu target it in the graveyard, then untap all nonland? Is DR in graveyard right before nonlands are untapped?
Shu Yun, the Silent Tempest WUR Voltron Control
Temmet, Vizier of Naktamun WU Unblockable Mirror Trickery
Ra's al Ghul (Sidar Kondo) and Face-Down Ninjas
Brudiclad, Token Engineer
Vaevictis (VV2) the Dire Lantern
Rona, Disciple of Gix
Tiana the Auror
Hallar
Ulrich the Politician
Zur the Rebel
Scorpion, Locust, Scarab, Egyptian Gods
O-Kagachi, Mathas, Mairsil
"Non-Tribal" Tribal Generals, Eggs
In other words, Dralnu cannot target DR before it resolved (and goes to graveyard). Thanks!
Shu Yun, the Silent Tempest WUR Voltron Control
Temmet, Vizier of Naktamun WU Unblockable Mirror Trickery
Ra's al Ghul (Sidar Kondo) and Face-Down Ninjas
Brudiclad, Token Engineer
Vaevictis (VV2) the Dire Lantern
Rona, Disciple of Gix
Tiana the Auror
Hallar
Ulrich the Politician
Zur the Rebel
Scorpion, Locust, Scarab, Egyptian Gods
O-Kagachi, Mathas, Mairsil
"Non-Tribal" Tribal Generals, Eggs