The Equipment costs four, is free in your opening hand, equips for three, and then gives trample and +1/+1 size too in addition to that double strike
I do want to give a shout-out to Twinning Staff, a cool little artifact which copies our copies
C Common Karakuri Cash Inn X TRAP Target 1 "Karakuri" monster you control and 1 Effect Monster your opponent controls
SE Secret Rare Trickstar Fusion X SPELL Fusion Summon 1 "Trickstar" Fusion Monster from your Extra Deck, using monsters from your hand or field as Fusion Material
But I dont think many players really find that style exciting unless you can also couch it within a more multi-dimensional, coherent theme
But although the price seems steep, even if your opponent has 1,000,000 life points they will still lose once you have all 5 pieces of Exodia