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The only "plausible" solution against spread variant is to win the stadium war and bring a Sky Pillar with you

So on its own, I would not recommend using Onix in a deck, even though it has a good hp, both of its moves do below average damage for an extreme amount of energy cards, and the retreat cost on Onix is too high in my opinion

For example, a behold card is best if you have the necessary card to reveal

Stick around and find out what the Bent Pack Trick is, as well as how to obtain and apply Flair to cards.

Cards like Kraven, Proud Predator and Kraven the Hunter do work in the deck, as both rely on large creatures being on the battlefield, which feeds into Venom, Lethal Protectors sacrifice mechanic