With 110 HP, it has modest staying power while also being able to Poison your opponents Pokemon simply by being in the Active Spot
The effect to put a +1/+1 counter on Twenty-Toed Toad doesn't require it to actually attack, so it can sit back and have other creatures do the heavy lifting while Twenty-Toed Toad sits back and grows its stats and draws you cards
I wouldnt be surprised to see it show up in other white aggressive decks, at least as a solid sideboard option against decks like Reanimator and Dredge
It also conveniently Cascades into both Sword of the Meek and Thopter Foundry, the two combo pieces included alongside Urza, Lord High Artificer where being an Artifact Creature certainly doesn't hurt
Summary Rare promo cards in MTG can have significant value, such as Swords To Plowshares and Mutavault
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