Royal King stealth

The most important mini's of this deck are Royal ghost and skeleton king. So you will want to place the skeleton king as shown above (or 2 to the left) and the Royal ghost closer to the wall.

When you place the Royal ghost, upgrade it to level 3 ASAP (don't forget to use re-rolls if you have to.

When you have the level 3 Royal ghost, it depends on the situation on what to place next.

If they placed a card such as: spear goblin, bowler, Prince, etc then place either bowler or giant infront of it so it acts as a shield.

If they have an exposed ice wizard, electro wizard, magic archer, dart goblin, etc then place Prince infront of it.

If they place spear goblin, but you have already used up your shield cards, then place Prince behind the mini the spear goblin is targeting.

If they are also using Royal ghost skeleton king, then either upgrade the Prince to level 2 and put it infront of the Royal ghost, or place a giant infront of your skeleton king. So they get distracted on that after it's invisibility runs out.