A four mana 5/5 Trygon Predator is already a big beating, but this is almost impossible to trade with in combat (there are three common cards with Deathtouch)
Tormod, the Desecrator is the classic pairing to generate board presence with your card advantage, but you could also try Glacian, Powerstone Engineer to facilitate the self-mill or Tymna the Weaver for even more cards
For starters, remember that you can only sacrifice a noncreature artifact to Iron Mans ability, but you can fetch any artifact card, including artifact creatures
It also has a bonus ability to create a 10/10 creature token, should you need it
Various game formats allow players to enjoy the game for many years
Recurring threats that need to be exiled are usually very powerful and difficult to deal with for almost all decks, and Vengevine is a key piece in dredge decks since it benefits from self-mill and is one of the better payoffs for the strategy