This Deck is all about pressure. You can continually apply pressure throughout the game with your various bait units and you can use the Royal Giant when they don't have the right answers in cycle. Use the Mega Knight and the Prince to defend and counter push and your opponent will always be on their heels. The biggest weakness of the deck is the fact that it has no direct damage since it lacks a spell. This being said, try to get as much damage as possible before double or triple elixir time.
The Royal Giant is the main win condition of the deck and you can bait out your opponent's RG counters with your bait units, the Mega Knight, and the prince.
The Goblin Barrel is the secondary win condition, you can bait out spells and chip out down the towers.
The Mega Knight is used for defense and counter push. Pair him with the prince and you can apply enormous pressure.
In single elixir time, you want to get as much damage as possible by applying pressure in both lanes with your bait units, prince, and royal giant. Use your mega knight on defense when necessary and apply pressure with him on the counter push as well.
In the later stages of the game, it will be more difficult to get damage but you can make big mega knight, prince, and royal giant pushes in order to break through when necessary.