When it attacks you get to make three Hamster tokens and then deal X damage to anything, where X is the number of Hampsters you control
And then you play against him, and every single Teferi deck plays the exact same way
Prosper, Tome-Bound decks can play fairly or enable busted combo turns thanks to the mana production coupled with all that delightful card draw
At the moment the best versions we have are this, the Box Topper from UMA and the FNM promo
So Warden great in a Landfall deck like this one, but easily fits into any White deck that runs a good amount of fetchlands, which the Warden synergizes particularly well with: playing and cracking a Flooded Strand gives you two landfall triggers to exile two cards, and you can even exile the Flooded Strand itself, putting it back into play once the Warden dies, which is a sweet (but convoluted) way to ramp in White
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