Peacocks text box suggests two deckbuilding avenues: first, artifacts that youd want to sacrifice for a benefit (other than the Clue draw a card ability), and second, you want creatures that give you a benefit by being unblockable (other than just smashing life totals)
Even without that, his -3 is pure value
You'll always kick it if you have the mana, and adding a card flow card into your removal suite is very strong here
Other Equipment might grant abilities such as flying, first strike, trample, haste, hexproof, protection from something, menace and more
Tibalt would be the synergistic and playable choice for the set containing Madness and Delirium
And since Boromir is three mana, you can even get him back with Sun Titan triggersI mean, who doesnt want to grind value with Sun Titan triggers