edhseer Commander synergy, explained
Sorcery
Mana cost: {3}{G}
Look at the top seven cards of your library. Put up to two land cards from among them onto the battlefield tapped. Put the rest on the bottom of your library in a random order.
on-cast —
Causes: put a land onto the battlefield.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Cartographer's Survey is one).
When a land enters thanks to Cartographer's Survey:
199 other cards care about it too. These are the ones with the most connections.
a sorcery is cast — 3,720 cards in the game can cause this (Cartographer's Survey is one).
When Cartographer's Survey is cast:
429 other cards care about it too. These are the ones with the most connections.