Does Rally the Troops buff only the next friendly unit played this turn, or all friendly units played this turn?

Ruling: Rally the Troops buffs all friendly units played this turn. Each time a friendly unit is played, a delayed trigger goes on the chain to buff it.

Nuances:

• If the effect only applied to the next unit, the card would explicitly say so (similar to how Ravenborn Tome is worded)
• The wording creates a condition for the entire turn that triggers whenever a friendly unit is played