edhseer Commander synergy, explained
Land
Add {C}.
activated {T} — adds 1 mana
Add one mana of any color. If that mana is spent on a multicolored creature spell, that creature enters with an additional +1/+1 counter on it.
activated {1}, {T} — adds 1 mana
activated {1}, {T} — arrives with counters
Causes: put a counter on anything.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Guildmages' Forum is one).
When Guildmages' Forum enters:
199 other cards care about it too. These are the ones with the most connections.
anything gets a counter — 4,415 cards in the game can cause this (Guildmages' Forum is one).
7 other cards care about it too. These are the ones with the most connections.