Dragon Soul is just too good in this format.

The main combo of the deck is to create 5/5 dragons with the weapon but how?

1- Play the weapon on T3 or T2 with coin (Litterally Unbeatable on T2 since Zephrys the Great cannot remove it)

2- Play Radiant Elemental alongside Test Subject

3- Buff the subject with Embalming Ritual, Power Word: Shield and then kill him with Topsy Turvy

4- Enjoy your Dragons

You can also use the Power Word: Shield on your dragons/elemental to get lethal with Topsy Turvy

Enjoy your quick wins :)

Ps: If you have already 7 cards in your hand stop using the Power Word: Shield otherwise you will overdraw.