White can struggle with card draw at times, but luckily, momo white in Commander has a lot of options
As for spells to flash in, you can do so much with a surprise Narset, Parter of Veils in response to a Brainstorm, an unexpected Elesh Norn, Grand Cenobite when an opponent swings out at you, or a sudden The One Ring when somebody tries to take you out
You need to strike a balance between playing lands and pitching them to Influence, but Bears tend to be cheap, so you can usually make do with fewer lands in play
Spin the wheel
Most formats let you include up to four copies of a crucial card, so you can improve your odds of drawing it by adding multiple copies (basic lands aside, which you can include in any quantity)
Are mythic rare cards always stronger than rares