You put your opponent on DD by assembling the Chaowish + Kythera + Ring of Morrigan combo, which allows you to cast say 20 copies of Chaoswish (and give 20 random spells to your oppnents, true!).

You can find relevant pieces through dobule Browse, Highland Princess, Dank Omphalos, Pnakotic Manuscript and 13 Treasures of Britain, which all work very well with dobule Plague of Frogs.

Else, it is a solid collection of synergistic blue cards that is a tad light on removal but has enough tricks and creatures with special abilities (e.g,,m Nelly, The Green Knight) or big bodies that you should be able to hold the field long enough and win without the combo.

Duplicator Combo

@Morgoth