Using Liquimetal Coating and his -1 ability you can turn him into an Artifact Creature Planeswalker.
Despite Tezzeret being a creature he is still missing a creature type. So after turning him into a creature equip him with Runed Stalactite and give him every creature type. He is a planeswalker after all, we wouldn't want to under do it.
But despite now having all the creature types he's still only 3 permanent types which strikes me on the low side.
Luckily now that he is a Saporling (along with every other creature type) you can play Life and Limb, turning him into a forest.
Once your Tezzeret is a forest cast Prismatic Omen and he'll gain all basic land types. You wouldn't want all his creature types to be lonely right?
But wait! Aren't we missing a permanent type? That's right! He's not an enchantment yet. To rectify that play Enchanted Evening.
Congratulations! You now have an Artifact Creature Enchantment Planeswalker Plains Island Swamp Mountain Forest with all creature types. What you choose to do with him is up to you.
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