A 5-mana flying deathtouch Villain from Marvel's Spider-Man that turns every attack into a wheel: discard a card, then draw one for every card discarded this turn.
Discard-outlet decks. Any discard effect used earlier in the turn compounds the card draw from the attack trigger, since the count is cumulative for the whole turn.
Rakdos aggro. Flying and deathtouch make it hard to profitably block, so it applies pressure while also refilling the hand it's spending on removal and burn.
Madness and graveyard decks. A deck already discarding cards for value gets the attack trigger essentially for free on top of its existing plan.
How it does in Commander
As the commander
As the commander it rewards building specifically around discard outlets — the more of the turn's discarding a deck can front-load before combat, the bigger the attack-trigger payoff, which makes it a real build-around rather than a value creature that happens to lead the deck.
In the 99
A solid aggressive body on its own thanks to flying deathtouch, with the card draw as a real bonus in any Rakdos deck that's already discarding cards for other reasons.
Formats it's strong in
Discard and madness shells. The attack trigger scales directly with how much discarding the deck is already doing, rewarding decks built around the mechanic.
Aggressive black-red decks. Flying deathtouch is hard to block profitably, keeping the attacks — and the card draw — coming.
Formats it's weak in
Decks with no other discard outlets. Without anything discarding earlier in the turn, the attack trigger nets exactly one card, which is fine but not exceptional for five mana.
Slow, defensive decks. The upside is locked behind attacking, so a deck that isn't pressuring the board gets little from the card.
Synergistic cards
Wild Guess — A cheap discard-and-draw spell that sets up a bigger payoff the same turn Green Goblin attacks.
Faithless Looting — Discards cards early in the turn, multiplying the count Green Goblin's trigger later cashes in.
Fiery Temper — A madness card that wants to be discarded anyway, turning a cost into a benefit alongside Green Goblin's own trigger.
As a recent-set card, Green Goblin, Revenant is inexpensive and a reasonable pickup for a Rakdos discard or aggro shell — worth trying without much financial risk.