Now, while this does mean that your dragons will be sticking around for a turn rotation, what makes this great is that it allows you to make use of ETB effects, and you have free choice which dragons to get rid of, if any
Underground Breach, Past in Flames, and Six all help to achieve this by giving your spells various abilities that let you cast them from the graveyard, usually for another cost
Note: this card is from the French version of Revised making it foreign black bordered
Green is also exceptional at creating an immense mana advantage, typically with cheap cards like mana dorks (Llanowar Elves, Badgermole Cub) and land-based ramp, which is pretty unique to green (Rampant Growth, Cultivate)
If you said Chandra, you're wrong
The Portal Three Kingdoms version from 1999 is double that, at over $300