Vein Ripper punishes opponents for trying to deal with it and easily punishes an opponent for letting it stay on the battlefield, given any sac outlet, multiple blockers, or board wipes, each of them can trigger the ripper multiple times
This plays incredibly well with a deathtouch enabler like Basilisk Collar to kill anything, regardless of how much damage this red creature deals
Goblin Welder would work hilariously well with this, but it'd be really hard to ensure you actually get it
With cards like Wakening Suns Avatar being a non-dino board wipe and comically large beasts like Apex Altisaur, this deck is wild right out of the box
Witch of the Moors Lifegain decks need solid payoffs that impact the board, and Witch of the Moors fits that perfectly
Getting it in your opening hand really makes it insane, since it can let you Scry before the game even begins, and thats something that can give you a very really early game advantage