
Enchantment
Sacrifice a creature: Draw cards equal to the sacrificed creature's power, then discard three cards.

Sacrifice a creature to draw equal to its power, similar one-shot draw payoff.

Sac a creature to draw cards equal to power and gain life, instant-speed version.

Sacrifices a creature for cards equal to power plus life gain.

Planeswalker that can sacrifice creatures to draw cards.

Free sac outlet that synergizes with big creatures dying.

Free sac outlet to fuel mana and enable creature loops.

Green card advantage engine for creature-heavy decks.

Draws cards when creatures enter, big green card advantage payoff.
Use the sacrificed creature's power as it last existed on the battlefield to determine how many cards you draw.
If you don't have three cards in hand when instructed to discard three cards, you discard your hand.
You draw and discard cards all while Greater Good's ability is resolving. Nothing can happen between the two, and no player may choose to take actions.