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God-Eternal Oketra Legendary Creature Zombie God Double strike Whenever you cast a creature spell, create a 4/4 black Zombie Warrior creature token with vigilance

Dont let this incredibly powerful creature cause you to shortchange the other two though 2 mana for a creature that taps for 2 mana is a ridiculously good rate, and Vedalken Engineer even provides colored mana to boot

Special Summon 1 Level/Rank 7 Dragon Ruler monster mentioned on it from your Deck or banishment, then shuffle that target into the Deck

Theres also the option of forgoing the Diviner of the Herald package and adding in something like Adventurer, so Lava Golem acts as a secondary means to deal with Kashtira, though that again depends on meta