Mono-White Hammer runs Lurrus as a companion, which happens to be one of the best decks in Modern at present
Some of the best Orzhov cards are not technically gold cards but do need to be played with access to both colours of mana to be worth it, as such the top ten is a top thirteen just in case you don't think they should count
3 Liberator, Urza's Battlethopter Speaking of incentives for playing additional artifacts, Urza's Battlethopter is perhaps the best artifact incentive currently available in Standard
When the spell or ability resolves, it checks the targets to make sure theyre still legal (that is, theyre still there and they still match the requirements of the spell or ability)
Some cards go up in price later, but even so, no one likes getting ripped off
It's about targeting your opponent's life totals above all else, with the aim of burning your enemies to the ground before they have the chance to take you out