Whenever you attack, you create a Food token for each player being attacked. (It's an artifact with ", , Sacrifice this token: You gain 3 life.")
, , Tap X untapped Foods you control: Create X 1/1 white Human creature tokens.
Apothecary White is a mono-white Food-tokens engine: attack to generate Food, then tap those Foods to crank out a wide board of 1/1 Humans, and convert the whole thing into life, sacrifice value, or a lethal alpha strike. Turn to turn you're building Food count, refilling the board, and leveraging go-wide payoffs and lifegain triggers.
Self-sufficient token engine that doesn't need other cards to start churning value
Vigilance lets White attack and still block, fueling Food every combat
Massive synergy with Food, sacrifice, and lifegain payoffs in mono-white
Generates a resilient, grindy board that recovers well from sweepers
Mono-white means weak card draw and no real ramp outside artifacts
Token production is slow and mana-intensive (, tap, tap Foods)
Vulnerable to board wipes despite recovery, since the engine is incremental
Lacks interaction and reach found in other colors; can be outpaced by combo decks