The Gitrog, Ravenous Ride is an efficient threat, a sacrifice outlet, a draw engine, and a ramp piece all in one
Prossh has been rocking tables since Commander 2013 , and has a soft spot in everyones hearts
Along with that it reads: Whenever The Gitrog, Ravenous Ride deals combat damage to a player, you may sacrifice a creature that saddled it this turn
It's a shame that the card itself merely generates a measly 1-2 mana to pay for your cumulative upkeep cards, which isn't going to matter much within a couple of turns
Spellshapers require the discard cost in the activation because otherwise I would never not play Hammer Mage in a Red deck, for example
That's still fine and dandy, just like candy, but it's not as broken as Tinker from a mana rock into a Darksteel Colossus or the Spike version of that with Sundering Titan