April 2016 Card Nerf
It was announced on April 20th, 2016 that Big Game Hunter would receive a nerf.
- Mana cost increased to 5, up from 3.
Quote from BlizzardBig Game Hunter represents an inexpensive source of removal that is packaged with a minion. It’s efficient enough that some Heroes with powerful Class-based removal cards choose to run the neutral Big Game Hunter. We’re increasing the cost of the card from 3 mana to 5 mana.
-_-
Even without a target, he's still a 4/2 for 3, which is only a tiny bit below average. In a metagame with stuff like Ragnaros and the Giants, this guy's almost insane value.
you can't buff enemy minions with sun cleric.