When you do the weekly rasing the level will give you more strange coins. 3 for each level and the higher levels give the reward of the ones below them. so lvl 28 will give 9, unless you did a lower level one in which case 9 - the strange coins you already got from the weekly
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Tiger strike, i out of 10 blue engrams i end up getting atleast 1-2 strange coins and like 2 motes of light.