I know it looks like a mess but it works really good. Try to make a copy of the Hecarim with the Splinter Soul and lvl Hecarim during the attack with him and the copy (you have to have attacked with 3 Ephemeral units before that). But you really dont have to, you can really do some dmg with only a Kalista. Also you can get a very good start with the Cursed Keepers and some spells.
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