Strength of the Coalition

To determine a spell's total cost, start with the mana cost (or an alternative cost if another card's effect allows you to pay one instead), add any cost increases (such as kicker), then apply any cost reductions. The spell's mana value remains unchanged, no matter what the total cost to cast it was.

If a spell's kicker cost was paid, the spell is "kicked."

If the spell is kicked, the target creature will get both a +1/+1 counter and +2/+2 until end of turn.

If the target creature is an illegal target as Strength of the Coalition tries to resolve, none of its effects will occur. You won't put a +1/+1 counter on any creatures, even if it was kicked.