Best so far:
$10 Mercenaries — Defeated at stage 17
Team: Bone Dragon 6/11 · Goblin Raider 2/6 · Goblin★★ 4/8 · Goblin Raider★★ 4/12 · Giant 8/43
Really fun game! (The tutorial is a bit vague and I found that enemy teams have enemies of B or A at 2-3 stars past wave 10 which was a bit annoying. But the balancing itself isn't too bad.)