Dragon Arch

This came out of an era when multicolor stopped costing you and started paying you: a wave of artifacts and lands that rewarded the color commitment fixing had always punished. This is the cheating-into-play piece of that suite, and the restriction is what gives it a place to live. It deploys only multicolored creatures, so the payoff is gated behind the exact two- or three-color investment the design was selling; in a mono-color shell it is dead weight, and a hand with no gold creature gives it nothing to do. The structure is five to play, then two per activation, and with seven mana available you can crack it the turn it lands. The activation is what earns the slot: a gold fatty skips its mana cost entirely and arrives on the battlefield rather than passing through the stack, so it never meets a counter aimed at the cast and beats its own curve by a turn or more. Against top-end bombs carrying mana values in the high single digits, a two-mana toll to put one down is a steep discount, but it locks the artifact into one kind of deck: stuffed with expensive multicolored creatures and patient enough to lean on a recurring deployment engine rather than hard-casting its threats. Narrow by construction, but inside the deck built around it, it converts a clunky finisher suite into something you can unload one card from hand at a time, sidestepping the counterspells those threats would otherwise invite.