Varina has a 4-drop 4/4 body, on curve for the beats
I wouldn't say it's conclusive evidence, especially since we still don't know the relation between the Elder Dragon War and Bolas' ascension, but it does put the Elders in a time bracket prior to that of the Primevals
Otherwise, you just want a wide toolkit of Pokemon like Shuckle GX from Lost Thunder and Hoopa from Shining Legends that passively negate attacks, forcing your opponent to lose from emptying their library while failing to build a threat
Spider-Ham, Peter Porker and Oakhollow Village are excellent for pumping those rabbits up to make them bigger and more dangerous
Despite its age, you can find NM copies of this card somewhat easily, with over six recent sales to confirm a valuation of about $40 to $50, with some nicer copies jumping just above the upper end
Its particularly popular in the US, which helps if you ever plan to sell your cards internationally