Well, i’d venture that most players actually have such a deck. I call them Infinity-Loop Decks.
Usually, you have 2 Troops that fill each others
(Example can be Giant Spider and Green Seer. Play forever and Vine everyone.)
Then you put a “killer”, so either someone in front of different colours with high attack (in our example Red or Brown) that will hit the skulls while you chain (good advise to be impervious or insulated against Bone Dragon Freeze, and high HP or Giant trait against GloomLeaf barbs) OR someone that just kills with it’s trait, like Moloch or Plague or Kraken.
4th slot is your accelerant, that troop with full mana start that can kickstart the chain if no 4-match are available (like Sirens, Mercy, etc…)
It wins 100%, but as DonBoba said, some games are just very very long.