If someone has no maxium hand size, does Jin-Gixtaxis -7 to max hand size ability effect them at all?
No. You can’t reduce something that doesn’t exist.
seen from Russia
seen from Netherlands
seen from Russia
seen from United States
seen from Vietnam
seen from Germany
seen from Canada

seen from Italy
seen from United States

seen from Netherlands

seen from Sweden

seen from Malaysia
seen from United States

seen from Canada

seen from United States

seen from United States
seen from China
seen from Germany
seen from Mexico
seen from Mexico
If someone has no maxium hand size, does Jin-Gixtaxis -7 to max hand size ability effect them at all?
No. You can’t reduce something that doesn’t exist.
If Kheru Spellsnatcher dies after its ability has resolved and the spell is in exile, can the player still cast that card at a later point even though Spellsnatcher is dead?
Yes.
The ability to cast the spell is part of the effect of Spellsnatcher’s “when ~ is turned face up” trigger and isn’t tied to the Spellsnatcher herself once the ability goes on the stack.