Okay, the purpose of this is in the title. We aren't looking for necessarily overpowered strats here, just fun ones, heroic ones even that will make you laugh and are worth a punt in dire situations.
My first suggestion is
The Hero that is needed - 1CP
When a squad with the infantry key word is reduced to one model this strat can be activated. This model automatically passes morale and for the next battle round will be able to advance and shoot and charge with no penalty, will receive a 5+ invulnerable save (or +2 to their invulnerable save, if if they already have an invulnerable save, up to a maximum of 3+), and can re roll all hits, wounds and damage for that battle round.
This stratagem cannot be used more than once per game on that single model.
The idea behind it is that one guardsmen with a melta gun that has survived with their squad being wiped out, you can use this to buff them to do something fun and awesome in the game before they inevitably get killed by your opponent. It may result in a game changing action that is super cool, but it won't be game breaking. It's also more of a late game strat I suppose as you wouldn't get much value in turn 1 or 2.
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