While typically you don't want to give your own cards away, you invested in them after all, there are a few sneaky ways to take advantage of this ability
This is our last high-cost Curse, the other three left are no more than 4
In a world where serialized cards are becoming more and more common, how much do you think this card should be worth
They even combo together -as long as we have enough mana and cards to discard- to clear bigger threats as for 2 mana we can do 1 damage and place a -1/-1 counter on target creature, for 4 mana 2 damage and 2 -1/-1 counters, and so on
Its one of those decks you buy because you want to play the strategy included in it and upgrade it based on that strategy
In Ravnica, the guildless (those who don't belong to one of the ten-color guilds) have Guildless Commons, a land that produces two colorless mana