Tactics for the Swamp (Fortress).

With this setup: 19 + lizard-gnoll-gnoll-snake-snake-gnoll-gnoll, you can quickly ambush a wyvern with any hero.

And Tazar, level 8, with 3 hydras and 6 single gnolls (hydras in a stack of 2) can quickly take on a maxed-out "can" creature, losing 1 hydra. (80% sure)