One of the iconic cards from Judgment, this card is not as bad as it seems. If you target a 1/1 with the ability, you're getting a 4/5 for 4 with a very small downside. If you target a creature with Defender (that's not a wall), you're getting a 4/5 for 4 with no downside (same goes for if there are only creatures with Shroud/Hexproof on the field or if you control no Forests). However, getting a 4/5 for 4 in green isn't that spectacular, especially if it doesn't have any evasion. I'd much prefer something like Stampeding Serow in my "big green creature with a downside" slot. Not a bad creature, just not great.
Pros: Big creature
Cons: Forces you to give out forestwalk, no evasion