You can only use pre-built theme decks, which can be bought for pretty cheap, even with in-game currency
Explore is a major returning mechanic in Lost Caverns of Ixalan, and Hakbal deploys it to great effect
You can take infinite turns with Second Chance, for instance, or make infinite mana with Displacer Kitten and Lotus Petal
As such, an Ishkanah deck focuses on playing helpful spider creatures while filling up its graveyard with lots of cards to exploit Ishkanahs delirium ability and make even more spiders
This can be especially powerful in decks running three or more colors since you can fetch dual and tri-lands that likely get you every color you need, and the lands even come in untapped
Landers name is a little too spacey, but thanks to their relationship to land it doesnt feel like it pushes too hard you could have faeries for example, crafting little pods that create new meadows or fields, and they are the landers