You move the stats around a bit and add in the ability to make a second 3/3 on the following turn and it's pretty clear how much of an upgrade this is
Grind-intensive Golgari decks frequently find themselves casting an endless stream of removal and hand disruption spells that exchange resources at a one-for-one rate, with a single card or two finding a way to capitalize on the severe reduction of resources that the deck creates on both sides
Sure, some creatures are more useful than others, and you're limiting the number of times you can pull off various graveyard shenanigans, but if this isn't a major focus of your deck, who wouldn't like, say, a free Craterhoof Behemoth for a turn
No, you cant station at instant speed , as the station ability specifies station only as a sorcery. However, this doesnt mean there are no ways to enable the abilities on a stationed permanent at instant speed