You need fewer cards in the graveyard per activation (albeit more specific cards), it has the same activation cost, it will typically deal more than two damage per activation, it will get larger over time, and it has menace
Him and his support are all pretty cheap
If Pyromancy 101 is countered or otherwise fails to resolve (probably because the target became illegal), none of its effects will happen, including teach
Which also works well with cards like Moonshadow, or with Dark Depths and earthbend/awaken
So, I think you can actually play one of these in most Green decks and have it do something, and in some of them it might be really nuts This works during both players combat, and as long as you have some creatures it is going to drastically upgrade your board, often allowing you to swing for massive amounts of damage, or if youre behind, suddenly your smaller creatures can tangle with theirs
Goblin decks are able to spam out tons of creatures, giving you tons of opportunities to dish out a huge amount of damage very quickly