Shield Maiden Survival

Main idea is to keep shield maiden alive and abuse her ability as much as possible. There are really only 3 other heroes to be carful of being monk, skeleton king and wave master, ill talk about those later. Try to place a battle healer round one with miner if possible, wizard is fine also. Then continue to place healing ranger and Valkyrie while focus upgrading battle healer when possible.

Monk: he will get his agility faster then you even when spam healing so aim to either place a mirror or stall monk till you get ability. In most games monk will trade with shield maiden but sometimes if battle healer has the block upgrade while shield maiden is blocking monk will use his ability, kill himself and leave shield maiden on low health. Main aim with monk is to kill him fast. Sometimes you may not see results against monk till the last round as each round he becomes less effective.
Skeleton king: place Valkyrie near shield maiden near the front while healing ranger is at the back. Second round upgrade if possible and then third bring in battle healer. I recommend when upgrading Valkyrie to go for the increase attack and healing range go for the increase heals.
Wave master: place shield maiden up front to one side with battle healer directly behind then place miner to the other side to attack the likely healing ranger. With wave master if you can keep him focused on shield maiden then you will kill him faster.

This build has done me well getting me to 3000 trophies. Anything that cancels heals will be a problem but battle healer when fully upgrade can keep the team alive through block spam despite the anti healing.