This is my absolute favorite Golem deck right now in Clash Royale. Including both Prince and Dark Prince with Baby Dragon and Night Witch gives this deck quite a heavy punch.
This is one of those beatdown decks that you should NOT be afraid to take some heavy damage. You can even lose a tower completely in most matches. This is a simple deck to play so let's not over-complicate it.
Step 1- Identify what your opponent is playing Step 2- Identify how to best deal with your opponent's counter cards for your Golem push Step 3- Wait until double elixir time and execute a monster 3 crown push.
Night Witch is the best card to drop immediately after the Golem. After you do so the best thing to do is wait again until your opponent makes a move. If they fireball you'll have a ton of bats to support the rest of your push!
Golem will be the main force behind the deck. You'll use him mostly in double elixir time but often times, in a situation where you have a 2+ elixir lead in single elixir time you can execute a tower-taking push in the first two minutes.
Dark Prince is totally viable in the meta right now. He's a strong card to play behind Golem for his splash damage and also strong to push opposite lane with regular Prince if your opponent over-defends the Golem side (see video for example)
Early stages this deck can take damage so try to manufacture an elixir lead as much as possible to cash in on later. If you lose a tower early on don't panic, especially if you're gaining a positive elixir advantage for the rest of the match. You have a lot of tools are your disposal! Don't be afraid to use them!
Late stages you should have already identified what your "best case scenario" is in terms of a power push behind your Golem. For example, if your opponent has Inferno Dragon/Inferno Tower you want to use Golem, Night Witch, Dark Prince. If your opponent has Skarmy & Minion Horde use Baby Dragon & Arrows.