In terms of specifically Venusaur cards, though Base Set is rare and valuable, it doesn't hold a candle to the rarity of the Shadowless version of the Base Set
The relentless mechanic in which you bypass the card limit is an incredibly rare and otherwise unsupported theme
Eshki, Temurs Roar The trick with Eshki, Temur's Roar is to play low-cost creatures with high power, like the Phyrexian Dreadnoughts of the world, or evoke creatures like Spitebellows
There is a ton of support ripe for the picking
In this case, it seems that WotC thinks that these mechanics are RELATIVELY similar in value when placed on a creature, which again makes a lot of sense
Today, well review the best flash cards ever printed in Magics history