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The effect doesn't stack

Gavin Verhey specifically stated multiple times in this announcement that a lot of the terms of these tiers fall under feel. It is technically very possible to build an incredibly powerful Commander deck that falls under the deck construction rules of the Exhibition Tier, but these decks are specifically weaker than the average Commander precon according to the second tier

This seems to be a fairly rare case combining a limited Pikachu promo, with a hard-to-get grade and the generally overvalued Pokmon market

Ziatora is guaranteed damage the turn it hits the field, and provides compensation to help you replace whatever Inferno Titan equivalent you just hurled at your opponents face