While sitting a four-mana might be a bit tough and does restrict you from playing many artifacts of your own, being able to wipe the board will likely be worth running one or two of these in your deck
(Equipment, Auras you control, and counters are modifications.) Cosmo Memory When Red XIII enters, return target Aura or Equipment card from your graveyard to your hand
Playing The Fourth Doctor, as portrayed by Tom Baker, will allow the player to look at the top card of their library whenever they like, as well as active the Would you Like A...? ability a reference to this Doctors love of Jelly Babies which enables the player to, once per turn, play a historic land or cast a historic spell from the top of their library
Darkness Approaches asked for two cards from your hand as cost, but it didn't change the battle position of the Monster
Best Board Wipe Payoffs The best board wipe payoffs are conceptual
The other cards are pretty good, and Eijango is a land that really isnt played enough in Commander