Take the cost of the card, plus the grading cost and look at PriceCharting.com or ebay sold listings for comps on what you think the grade will be
For example, if two creatures you control with lifelink deal combat damage at the same time, Enduring Tenacity's first ability will trigger twice and you may choose a different opponent for each trigger
Meteorite, Evolving Wilds, Caves of Koilos, Shivan Reef If you have access to a bevy of cards like these, which have the ability to produce multiple colors of mana, you can begin to feel comfortable playing a three-color deck if you choose to
Blue and red have both had positive relationships with artifacts mechanically in the past (in addition to red's ability to destroy them)
Given that you cannot reasonably make this archetype in mono white due to zero effective payoff cards, and that many of whites token generation now produces artifacts it is not even certain that you can flash this back right away even with some board presence