edhseer Commander synergy, explained
Sorcery
Mana cost: {3}{G}
Look at the top six cards of your library. Put up to two land cards from among them onto the battlefield tapped and the rest on the bottom of your library in a random order. If you put fewer than two lands onto the battlefield this way, proliferate a number of times equal to the difference.
on-cast —
on-cast — proliferates
Causes: put a land onto the battlefield, proliferate.
Cares about: nothing.
you proliferate — 90 cards in the game can cause this (Expand the Sphere is one).
When Expand the Sphere proliferates:
1 other card cares about it too. These are the ones with the most connections.
a land enters the battlefield — 1,560 cards in the game can cause this (Expand the Sphere is one).
When a land enters thanks to Expand the Sphere:
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 (Expand the Sphere is one).
When Expand the Sphere is cast:
429 other cards care about it too. These are the ones with the most connections.