“Pocket” Golem

Chip away at ONE of your opponents towers with furnace. During early to mid game, focus on different small but rapid pushes: lumberjack and hunter (1), bandit at bridge in front of a fire spirit (2), wallbreakers by itself or combined with other pushes such as a lumberjack in front (rage will kill any swarms and gives a decent chance for at least one hit). Focus on overwhelming your opponent and ideally chipping away both towers. If furnace is on left lane, then push wallbreakers right lane. Occasionally switch it up and put wallbreakers left lane so that it is supported by the spirits. During late game randomly switch to golem (that you have been keeping in your “pocket”) and firecracker to catch your opponents off guard and secure a solid push. If the playstyle doesn’t work, then switch to golem mid game if needed. If opponent has poison/EQ then only use furnace defensively in center of your field. If they fireball it, don’t worry and just place a lumberjack in front of the surviving spirits so that you still get decent value out of the trade. If they have inferno tower then focus more on the spam aspect of the deck instead of the golem. If they use goblin barrel, then you can either hunter back of tower as soon as possible, place skele army back of tower, or perfectly time your furnace to kill all 3 goblins. If none of those cards are somehow not in cycle, then use lumberjack or place wallbreakers behind tower right before it lands so that the damage to tower is minimized. Best defensive combos are Hunter and skel army, or a well placed firecracker. Lead away troops with wallbreakers defensively to buy time and elixir. If a card is low but not low enough for your tower to take it, use wallbreakers properly at bridge to lead the opponent back to their tower and guarantee that it dies to your tower when it comes back. If lucky, the WB will do damage as well.
If they princess back, wait for the princess to get around a third to halfway between their tower and bridge and place a firecracker to chip away at their tower. They will typically not be able to react in time to save their princess. This is a custom made deck that I have primarily used since 5-6 or so years ago. I have not experimented with different tower cards for this deck as of this moment (other than Princess), so use at your own disclosure