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Also, clones (summoned using the "phantom summon" magic) possess a good ethereal quality, so you can send them in first to fight the ghosts. But it's interesting to know who will hit whom and on which attempt?:D
And if you also take into account that a phantom can summon a 30 percent clone (and that clone can summon its own 30 percent clone), then the ghosts' chance of survival approaches 0:D :D :D
P.S. If you take all the tricks into account, you can get up to 50 percent, and also reduce the monster spawn interval threefold.