Just tested this deck mostly unupgraded...without towers was just too slow:
seism has easily and fast creatures for 50+ dam on the table (even L-Bolts wont help a lot, taking out some elite shriekers...)
i couldnt build up enough damage before running out of dim shields (brought 3 to the table, just in time with 7 life left), as unupped dragons do only 5 dam vs. diamond shield...u simply dont have that much time. at least i didnt...