Couldnt be me, I swear
When you cast your next spell this turn, exile cards from the top of your library until you exile an instant or sorcery card with lesser mana value
, Frank answers this exact question: Colored Mana Sources Required to Reliably Cast Spells As we can see from Franks work, the answer for how many duals lands you need for a two-color deck is not cut-and-dry
I wouldnt value them higher than I would any other foil version of the card
But a week later, I'm researching the meta, working out the optimized time to open packs around my sleep schedule, cursing every time the staring coin flip forces me to go first in a battle, and desperately trying to convince my editors to let me write about the game so I can write up the micropayments as a business expense
Receive, count, inspect, and catalog first