The original [casthaven]Karoo[/casthaven] lands and the Ravnica bouncelands, such as [casthaven]Simic Growth Chamber[/casthaven]
There are two recently printed common two cost sorceries in this genre that exile two for the next turn for cheap enough to play they are pretty pricey too (Wrenn's Resolve is sold out here and as high as 2 bucks on other sides, Reckless Impulse is also sold out here and tends to be closer to 2.50 on other sites) The only cheap is the uncommon from a limited Commander only set, Inspired Tinkering, also sold out but a cheaper 30 cents on other sites
This makes the creatures Nahiri, the Harbinger fetches incredibly consistent, but the set-up required doesnt bring Nahiri very far up the ladder
Even if you just have a few mana sources up after casting it you can now tap them for triple mana to essentially give you another turn
Its second attack needs two colorless energies and three fire energies, to use the attack players must discard 2 energy from the Pokmon, however, it deals 300 damage