015rr066u30671l027an037ee067ka017qh0280a0380h018pj
This is the most successful version of the Singularity Combo deck I've tested and the highest win-rate deck I've found for Demigods.
For those unfamiliar with this deck, the goal is to get a Singularity on your opponent's side of the field and let that Singularity kill them.
To achieve this combo, you need 5 cards in your hand: 2 Supernovas; 1 Tomb; 1 Give; 1 Lightning or Give.
The combo works as follows:
Step 1 - Play 2 Supernovas to summon a Singularity.
Step 2 - Play Tomb.
Step 3 - Play Give on the Tomb to give it to your opponent.
Step 4 - Play Lighting or Give on your Singularity, killing the card and triggering the Tomb transformation to a Singularity on your opponent's side.
Additional (optional but helpful) steps:
Step 5 - Play Adrenaline on opponent's Singularity.
Step 6 - Play Quintessence on opponent's Singularity.
Of these, Quintessence tends to be the most important. If you have to discard one of these cards, discard the Adrenaline and keep the Quintessence. However, if you do have both, Adrenaline must be played first because Quintessence prevents further targeting.
The remaining cards in the deck are draw cards to help you get the combo out as soon as possible. In Demigods, if you don't get the combo going before turn 5, you will likely lose. Games are decided relatively quickly and with minimal effort once the combo gets going. It is a fantastic way to farm Demigods.
EDIT
I received some requests for an unupgraded version:
0553501l35025c7025fu065lq055rr03621066u3018pj
This deck is obviously not as good, but is still serviceable at the highest difficulties of the game. It only requires 6 upgraded cards - the Supernovas.
For this deck and the deck above, I would recommend using a mulligan on any starting hand that does not contain at least 1 Supernova. The draw cards can help you get the other pieces of the combo, but everything requires Supernova to get started.