An excellent strategy in green and black for exploiting flashback is to include spells with flashback in a deck that tries to fill its own graveyard to reanimate creatures
Thats a lot of things to consider, but what this deck does do is create an Esper-themed attacking matters deck
It works best with fast mana like Mana Vault and Ancient Tomb to power it out and pay the intense tax
Legendary Creature - God Creature (CTRL to add secondary) Land Land (CTRL to add secondary) Tokens Urabrask's Forge At the beginning of combat on your turn, put an oil counter on this artifact, then create an X/1 red Phyrexian Horror creature token with trample and haste, where X is the number of oil counters on this artifact
While not a mono green deck, I have a Simic (blue/green) Sea Monster deck that I play this card in
But this also has the upside all Flying auras do, w hich is that you can justslap it on some big monster and quickly win the game