It is rather weak against rush, because explorer and story teller gives them too much. It also is weak against ramp because, beside maybe Tree, which is hard to play, your scaling is quite bad compared to other ramping. So on the current ladder, your best chances are lucky abd early flowers and whales to take the lead.
On casual, hoewever, it is completely possible to meet super slow setup and brawl with them up to fatigue and mill them.
If you can landblock your opponent with explorer and vine wall, even for one turn or two, go for it (even if the opponent eventually get to play explore, it’s delayed value), while you possibly evne collect with explorer).
If you can burn opponent cards with story teller, go for it.
If you want to drop the mill part (story teller and intrepid explorer), You can maybe put things like seedsower in, as well as taunts and primevael collossi, and drop the Tree. Or splash yellow in for Iona smile and sky yaks, for consistency with whales and because yaks are great against rush and single target remover.
If you want to accentuate the mill part, maybe put hunted outlaw instead of vine walls, and one shimmering statue in. The idea being that you want to produce more neutral lands, which diminishes the value of the wild growth of vine walls (forest can pop on neutral rather than on ocean). But the vine walls synergize really well with explorer to landblock your opponent, and structure taunt is very resilient defensively (immune to creature removal, which are the most commonns). Some taunts, and Tarum might be an option too.
