Speed isnt a good mechanic to dabble in, and Loxodon Surveyor is one of only two green speed cards in the set
Invasion came out, and split cards were a huge hit
Gamble incurs some risk (duh), which can be mitigated by playing a deck where you dont mind if your cards end up in your graveyard
It's totally not like you can untap a creature for 1 mana
Obviously, Crown of Skemfar is a fantastic addition to Elf Tribal decks, and it gives them an excellent answer to flying creatures too, something the green/black deck typically struggles with
In that case, you can easily get cards in the Lost Zone with Comfey [Lost Origin] and Colresss Experiment [Lost Origin], Lost Vacuum [Crown Zenith] a Forest Seal Stone [Silver Tempest] in play, accelerate Energy with Mirage Gate [Lost Origin], and attack with Radiant Greninja [Astral Radiance]