If you cast a spell with casualty this way, you can pay the costs in any order, which means that you may remove a counter from a creature then sacrifice it to pay the casualty cost
Thassa, God of the Sea has value as a cheap big creature with decent abilities, but I dont think it even comes close to how good Thassa, Deep-Dwelling can be
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There is no further explanation than that given
While not spectacular, it does help deter the opponent from using effects that target it
