A lot of balance and care goes into choosing the cost of a card, more than I can express here, but looking for similar effects on existing Magic cards can give you an idea of a fair costfor example, a ramp spell that puts two lands into play ought to cost 4 mana, per Explosive Vegetation
You also need a large battlefield of creatures, but at that point, you don't need a stat boost or trample because the creatures can deal with your opponents on their own
There are a few creatures that can draw you cards
By synergizing with what white does best, playing auras, enchantments, and equipment, activating this trios draw effects are a cakewalk
EDHREC lists it currently as the 36th most popular commander in the game
each Collector Booster contains: 15 Magic: The Gathering cards Collector Boosters may contain these cards: FDN 1271, 282487