- I've run it in the past in my Primal Surge deck (although I do agree it is outclassed by Sakura-Tribe Elder and Wood Elves).
- More recently, I briefly tested it in Averna, the Chaos Bloom cascade.dec, which was minimizing cards with CMC 4 or less (to guarantee a hit on Unexpected Results).
- I've also brainstormed Possibility Storm decks that wouldn't want to run cheap sorceries.
- If you're running a bunch of cycling synergies, it may be worth consideration - there aren't that many cards that have cycling triggers.
- Can also be good with some graveyard synergies, like Genesis and Meren of Clan Nel Toth.
Otherwise... I'd say the biggest issue with Tusker is that it isn't actually ramp - putting a land into play is way stronger than putting one into hand unless you're consistently missing land drops. If you want this effect, I would strongly recommend considering Shefet Monitor, who actually ramps and also has the added utility of fetching utility Deserts like Scavenger Grounds.
As others have mentioned, Tusker does also draw a card, which means it isn't strictly outclassed by ramp effects that only fetch lands, but... Divination doesn't really excite me, and green has plenty of other options for card advantage.