Shadowverse

Unfortunately (or fortunately?), the main problem with the Worm isn't the lack of AoE, but the banish/transformation, the need to play it perfectly, the useless vanilla body that messes up your tempo, the lack of good tools for board control, the lack of good followers, the lack of pressure, the need to play all parts of the combo (Viridia and its evolution, Ram, Claw, Chain, Gift to the Bloodseekers) at the right time and not too early or too late, and all this while not dying, which is difficult when you lose half your health just by playing cards, without any effort from the opponent. It's more correct to consider this deck as a Darkfist deck that is played with or without the Worm; the very concept of a "Yhorm" deck has completely died, not even having time to live, and all these points are also relevant for DFB. So... One more reliable AoE is, of course, good, but it eats up Viridia's evolution and won't solve the deck's real problems.
But the Behemoth will be great in Mice, and possibly even in a "Yhorm" deck, taking the slot of... drumroll... Yhorm himself, lol. Really, why play a vanilla 5-5 body that will be banished and won't even be able to trade, unless it evolves, if you already have a new reliable AoE for the same evolution cost, and if you can play an overstatted body with Demonic Strike, which can also damage the opponent's face closer to the DFB turn, and clear an enemy follower.