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Combo is: Boomstick->Play SoI and have 2 SoD on hand-> Use Endow on Boomstick->Use SoR on Golem-> Use PU on Golem-> Use Golem's skill on each other until opponent dies.
Tricky thing is that you need to draw SoR *after* you play SoI, or the shard will become a golem instead. Use Scattering Wind if you have too many SoRs on hand (Can't have more than 1 if you want to ensure Endow skill when making golem). Use Inno on unneeded SoR,Towers, SN or extra Boomstick.
Beginning of combo can be slightly changed depending on opponent: If he has no PC, play Boomstick one turn earlier so that it can use skill on golem to ready it when it comes out, if he has no CC, you can play golem earlier, if he has both or if you get lucky with draws, you can play 2 SoRs on golem same turn you play it, once to ready Endow skill, the other to ready Boomstick skill.
Note: Even with Inno and Wind you can still get games you can't play the combo because you can't draw a SoR after golem. In that way this deck is more luckbased than other OTK decks. Deck is mostly for fun though, might work in pvp, I dunno.