Just look at Niv-Mizzed, Guildpact, a five-mana five-colour 6/6 with Flying and Hexproof from multicoloured that lets you deal damage, draw cards and gain life if youve got colour pairs among your permanents
It too has some interaction in the form of redirects, but above all, it wants to see life totals melting as fast as possible
If you're casting a seven mana spell freely, odds are you don't need to worry about losing the game
A listing at TCGPlayer.com has a rare Sol Ring One Ring card serialized (with xxx / xxx) for $11,000
You can get some thematic ones, like Gyre Sage in +1/+1 counter decks, but the combination of any color and hexproof makes this a reliable dork for any deck
It turns out that there are more than a few creatures that get a lot better when you turn them into artifacts and give them a mana ability, especially if you want to give yourself a repetitive stress injury in your wrist by tapping and untapping Horseshoe Crab, Simic Ragworm, Soliton, or Morphling until they kick you out of the LGS
