The action description on the card states that when the player casts a noncreature spell they can put a +1/+1 counter on any other Dorat cards, which due to the cards already having 1/1 stats would mean that the player would need to play a lot of the same Dorat cards to be any threat to their opponents.
Otherwise, as paper play starts to return around the world (hopefully sooner rather than later), people are going to need Ice-Fangs for their Modern decks regardless, as I think its going to remain a staple of the format whatever happens thats a slightly longer horizon but the foils are fairly well drained already and it wont take much to bump the card up in price
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Expend only cares about mana spent to cast spells
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It is crucial to verify the card's condition (PSA, BGS, CGC grades are reliable indicators) and the authenticity of the '1st Edition' stamp, which distinguishes it from 'Shadowless' or unlimited versions