Hearthpwn

This is an OTK combo deck featuring Ysiel Windsinger as the primary combo engine.

For the combo to go off we need to discount either Ysiel Windsinger or Malygos two times or, preferably, both of them one at a time since it gives a bigger discount overall by one mana. For discounting we use Imprisoned Satyrs. We absolutely have to make sure the discount lands on either/both Ysiel Windsiger or Malygos that is why we run only the necessary minimal amount of minions of our deck excluding Kael'thas Sunstrider which is just too good to pass. However we can't allow the discount to go on Kael'thas that's why we have to play it before Imprisoned Satyr awakens. Luckily for us, we can play the satyr on one turn and Kael'thas on the next, which makes it more convenient. 

When we have both Ysiel Windsinger and Malygos in hand and both/either of them are discounted twice, we can perform the combo. If we still have Kael'thas Sunstrider sticking around it will be even easier to go off. We play both Ysiel Windsinger and Malygos and then cast two Nourishes, effectively gaining mana as well as drawing cards. Then we copy Malygos once with Germination and kill the opponent with two Starfires. We can also use Swipes for that purpose if we damaged the opponent a bit. 

An important moment: we have to keep our Nourishes for the combo because it is the only way to ramp while Ysiel Windsinger is on board - Innervate will cost one mana which nullifies its effect (it is here mainly for earlier Kael'thas Sunstrider shenanigans). There is also a small possibility of discovering a Nourish with Worthy Expedition which is also good.