BG Food and Mardu Sacrifice want this at P1P4 to P1P6 as a maindeck closer, not a flex slot. The math is specific: at seven mana in a medium-speed format, the top end has to stabilize or end the game the turn it lands, and a 7/7 trampler that gains three life on entry does both at once. The entry sacrifice also turns on Disappear that same turn: feed a token, gain three, and at the beginning of your end step you draw, because a permanent left under your control during the turn. That end-step draw is the line separating this from the format's other expensive bodies; none of them banks a card the turn they resolve.
The token-or-land restriction maps onto the food subtheme without friction. Anchovy & Banana Pizza and Omni-Cheese Pizza already make fodder you want to spend, and this is what spends it. The landcycling commons cover the late game: by turn seven the lands you would rather draw as cards become exactly the thing the entry trigger eats, converting one into three life and a draw without asking the rest of your board to die. The loop holds even after your token producers get picked off.
The relevant punisher is Stomped by the Foot. It has no haste, so the attack trigger never fires the turn it enters anyway; the only thing in motion is the entry trigger, which has already resolved before they get a window. Grounded for Life is the harsher answer, since it destroys any creature and does not need the body tapped to land, so it can take this down clean. Even then you have already banked three life and a card. UR Sneak and the flying decks cannot cast a double-green seven-drop and have nothing to sacrifice; for them this is not a card.
