I was talking about something like
1. [19] Cheetah speed, Move 2, Ring of Beasts
2. [21] Fox, Fox
3. [21] Fox, Fox
4. [21] Move, Falcon, Enchantment
5. [23] Pet Steelclaw, Enchantment
6. [9] BM attacks, Shift Enchantment to move Cheetah Speed to Bear, reveals both enchantments.
Lets assume that the Beastmaster is cagy, and never presents a good opportunity to cast an AoE, but that the Wizard is cagy also, and doesn't try. Depending on who has initiative, the Earth Wizard can respond with something like
1. [20] Mana Crystal, Iron Golem (default opening against Beastmaster)
2. [13] Dragonscale Hauberk, move 1 forward, (conservation turn to learn what the BM is up to)
3. [16] Gorgon Archer
4. [11] Voltaric Shield, Poison Gas Cloud in Wiz's NC, Arcane Zap, move back if possible
5. [11] Voltaric Shield, Teleport/Force Push (Depending on what's happening with the slow creatures) and Arcane Zap, moving back if possible
6. [16] Voltaric Shield, Teleport, Stonegaze Basilisk
The Earth Wizard's goal here is to kill the level 1s with direct fire while stalling the Bear and the Beastmaster by pushing and teleporting into the Poison Gas Cloud. If a Bitterwood Fox takes 2 damage from a Poison Gas cloud, then Arcane Zap or a good roll on the Basilisk can be enough to kill it. Basilisk + Archer + Arcane Zap will kill weenies quickly. Then the Wizard will turn the Cripples and the Weak tokens onto the BM and the Bear. Meanwhile, the Iron Golem chills out on Guard, potentially being teleported back into position if the BM teleports him away. If the Wizard gets an opportunity to cast a second Archer while the first is still alive, it's all over but the crying.
How much slower an attack is the Beastmaster willing to make? Are you thinking of a Lair or multi-crystal opening? I don't think giving the Wizard more time to prepare a defense improves this matchup. The big flaw in the BM swarm plan is that it's so easy to kill weenies, and I don't think the Wizard will let the Beastmaster stockpile little furry missiles, but instead will hunt them with Archers and Rocks.