Second, you have some control over the creatures youll put into your graveyard
A powerful card that works in the deck but not for the deck if that makes sense
How to Determine the Converted Mana Cost of a Card In Magic: The Gathering With the exception of visual reminder cards, such as the Monarchy token or planeswalker emblems, all Magic cards have a converted mana cost, including tokens (whether creatures or not) and all lands
If the target spell is an illegal target by the time Mana Drain tries to resolve, Mana Drain doesn't resolve
In this one I finally had the pleasure of discarding Harvester of Misery to kill some flashy, spicy, exciting creature (dead is dead though, am I right?) with Hostile Investigator in play
Sure, it has a drawback, but if your deck is built correctly, it shouldnt pose too much of a risk to your game plan