This is a direct counter to immorushes and other decks that can have ridiculously high damage on the very first turn.
However, no other types of decks have that much damage potential, and so then the low cost becomes negligible, its drain quanta clause devastating.
some speedbows are overpowered, this counter such speedbows, now we just need to make it so this card doesn't counter underpowered decks.
(though whether a deck is underpowered or just bad is up to opinion)