How competitive is this fast “Frog in a Blender” deck in Premodern?

4 Llanowar Elves
4 Fyndhorn Elves
4 Wild Mongrel
4 Basking Rootwalla
4 Jackal Pups
4 Call of the Herd
4 Grim Lavamancer
2 Naturalize
2 Sylvan Library
4 Incinerate
4 Rancor

Land (20)
4 Karplusan Forest
8 Forest
8 Mountain

Sideboard
4 Winter Orb
4 Powder Keg
4 Tormod's Crypt
2 Naturalize
1 Uktabi Orangutan

This is a remake of an old staple. It's a very, very fast deck which applies non-stop aggression and draws out every turn on Sylvan Library when it hits too.

Save extra lands in your hand and put Rancor on Wild Mongrel. Then attack and discard the extra lands whether or not the Mongrel gets blocked. You'll overwhelm your opponent in no time.

Updates
27 min
It's possible to build this without the mana elves.

Instead have:
+4 Pouncing Jaguar
+2 Rogue Elephant
+2 Lightning Bolt

This gives more turn 1 aggression and 2 extra late-game finishers, but has the drawback that you can't turn 2 Call of the Herd.

You hold Grim Lavamancer against "Rock" decks and play it after they board wipe. Then you finish pinging the other player to death using your Graveyard as a Resource.
How competitive is this fast “Frog in a Blender” deck in Premodern?
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