This is a Galakrond priest with an OTK ender. In theory it’s good for two reasons, one is you have an advantage vs a control matchup and second you don’t have to worry as much about managing resources that you generate through invoke rng, they’re only going to be used to work your opponent and keep them busy so just play that bonus Velen or whatever.

the combo requires a heavy fate weaver discount, plus the activation of the shadowform hero power. 

first you play clockwork automaton, then hit it with embalming ritual and grave rune. Then kill it with wretched reclaimer to pop out 4x clockwork automatons and give yourself a 32 damage hero power.  

For those counting at home that’s 15 total mana with the hero power. That means you can safely play a fate weaver with any 1 of the 4 combo piece in hand and play the second one when it is all assembled.

cleric of scales and jepetto joybuzz are incredibly good in the later rounds when you’re digging for your last combo piece.