Not Tactic cards, just general tactics to slow down the Green Tide. Orcs have only lost once in our games, that was during the first session when they lost 2-1 to Dwarves.
Games featuring Orcs:
Dwarves vs Orcs 2-1
Empire vs Orcs 0-2
Dwarves vs Orcs 1-2
Empire vs Orcs 0-2
Chaos vs Orcs 0-2
Chaos/Orcs vs Dwarves/Empire 2-0
Dwarves vs Orcs 1-2
Chaos vs Orcs 1-2
Only have 1xCore Set, apart from the Chaos/Orcs vs Dwarves/Empire game, every game has been with adding random 10 Neutrals from 23 (in some games 24, but Infiltrate has been sidelined for now).
They just have so much damage potential, with Boar Boyz, Choppas, etc., with Followers of Mork helping to boost those units that gain bonus from having wounded units. And there is of course "Waaagh!" which can net just nutty damage (best thus far is assigning 50 points of damage, that's after 1x Demoralise). Dwarves have done the best, as you'd expect, they can throw the best meat-walls between their Capital and the Orcs. Empire hasn't stood a chance, Chaos similarly, though today's game (the last one listed) was a very close affair.