While it costs a ton of mana, knowing your opponent is just a mana source or two away from killing you with a huge drain effect is stressful and changes the way you play the game, so simply the threat of being killed by Ribbons might be enough to make the card semi-playable
(May I suggest kicking Keldon Overseer first and sacrificing one you borrowed?) All kicker costs are paid at the same time as the spell's other costsas you're announcing the spell, before anyone can respond
This card requires far more commitment, but it may be absolutely worth it
You will likely end up with a big threat, some Lands in hand, and a solid topdeck lined up for next turn
Expect to see many green decks with four copies of this card in the days and years to come
Old-Growth Troll Old-Growth Troll is a 4/4 creature for 3 mana, easily castable in mono-green aggro decks