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While they would be far less exciting without either one of the life gain or the persist (but still having a 4 life gain) the Finks would still be a cube worthy powerful monster

The most played cards in Vintage are, unsurprisingly, the Power 9

It always costs a single mana, and it adds to our artifact count, which is a nice bonus

There were spells in this block which would refund their mana cost by untapping lands equal to their mana cost

(Damage dealt by those creatures also causes you to gain that much life.) When this creature enters, create two 1/1 white Cat creature tokens with lifelink

Its just raw power creep