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There arent any golden rules for that and its very matchup dependent

I still have

One (1) Special card

Spend this mana only to cast an artifact spell or activate an ability of an artifact source

Gamechangers for Kenrith Muldrotha, The Gravetide Do you hate it when your opponents blow up your stuff

Here are a few options that each one can search: Trinket Mage - Esper Sentinel, Sensei's Divining Top, Shadowspear Tribute Mage - The Soul Stone, Arcane Signet, Grinding Station Trophy Mage - Buster Sword, Extraplanar Lens, Simularcum Synthesizer Transit Mage - The One Ring, Roaming Throne, Iron Man, Titan of Innovation Tribute Mage - The Great Henge, Knowledge Pool, The Immortal Sun #3 - Harmonic Prodigy Harmonic Prodigy