Petra, Dismissing Consort

{t}: Tap target creature.
{r}{t}: Detain target non-legendary creature.
{t}: Untap target human ascending a permanent, which loses Ascend.
Ascend - Tap 2 humans you control. They do not untap during their untap steps. Petra gains the abilities below:
Upkeep: {r}
Opponents' abilities targeting creatures you control cost an additional {2} for each Orator you control.