Tsapko's RW deck played ten such finders
That was thanks to a licensing deal with Magic the Gathering publisher Wizards of the Coast
All Property (Lots) are sold "As Is" "Where is" and without recourse
Unfortunately, I vastly overrated the short-term demand for this card
Once it resolves, you add one red mana for each card in an opponents hand, that mana sticks around through phases until the end of the turn, and then Inspiring Refrain resuspends itself with another three time counters, letting you cast it again later
In my years of personal experience, examining good decklists, and talking to people much smarter than me, 50 mana sources is about the right number for most decks to shoot for, usually 37 lands and 13 ramp sources for a general budget deck