The Card Day of the Dragons says the following:
When Day of the Dragons leaves the battlefield, sacrifice all Dragons you control. Then return the exiled cards to the battlefield under your control.
Note the part I've highlighted. What exactly does that mean?
For example, if I invoke a dragon card after using the enchantment (Dromar, the Banisher for example), when the enchantment leaves play do I have to sacrifice both my 5/5 Dragon tokens and Dromar?