**Hello i started playing this game 6 days ago and discovered that water monsters are very fun and strong(Climbed from bronze 2 to silver 1 in 2 days)
All you need to rent is just a 2 cards they are cheap-cost is max 4dec per day for rent
first card is of course Venari Wavesmith-this card gives you +2 armor for every monster in your team,he is also a mage who has great synergy with alric stormbringer and every tank,and creeping ooze who slows enemys and let you hit them first!It rocks :D
So generally your team should looks like this:
When you dont have that much mana you can look for some cheaper tanks like albatross with great flying tech or cocatrice :D Good luck and have fun tell me in comments if you tried this build and tell me your score Win/lose :)