Well, its Darkness type attack, which costs one Darkness Energy and two Colorless, deals 160 damage and makes the Defending Pokmon Confused (check out our guide to Status Conditions in Pokmon for more details)
It's EtB trigger is quite narrow and it is a one off effect but it near guarantees that Thundermaw is unblockable for its first attack
If there's one card that wants creatures put onto the battlefield without casting them, it's Preston, the VanisherPreston, the Vanisher
Then, if that wasnt enough, this legendary inflicts one damage to each opponent for every zombie under your control at the start of tour upkeep, and gives you scry for each zombie too
is an ability that allows players to gain a lore everytime they put a card into their inkwell