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During your opponents Main Phase, you can send Effect Veiler to the graveyard to target an effect monster your opponent controls, then negate its effects until the end of the turn

The Spirit token will be on the battlefield before the Zombie token enters the battlefield

It looks something like this: [Cost 1], [Cost 2], [Cost 3] : [Effect]

Gramma Tala Keeper of Ancient Stories Speaking of tough grandmas, this Gramma Tala has a decent draw ability you could consider including in your deck

using Immortal Dragon on field and banishing Changshi from the Deck Changshi SS itself by banishing the Sleeper you sent then mill Loading

Since it is basically an equivalent exchange, he wants to chain to the abyss at the time of dual summoning