While Seal of Cleansing might be more powerful than Disenchant in the present day, Disenchant ruled the roost as the enchantment/artifact removal spell of choice for a majority of Magic history
Its alternate casting costyou exile a green card rather than pay 4 manamakes it a free answer to cards like Chalice of the Void, Leyline of Sanctity, or Ensnaring Bridge
When this happens, it sets us up to win the game on Turn 4 with the help of our second combo piece Riverchurn Monument, which mills equal to the number of cards in our opponent's graveyard
And that's the problem with Rashmi
Since Wizards of the Coast doesn't put color limitations on removal spells these days, nearly every creature printed is vulnerable to spot removal in some shape or form
It turns out it is really difficult to play a fun or even a functional game of Magic when you start the game down two or three of the best cards in your opening hand