edhseer Commander synergy, explained
Land — Cave
Add {C}.
activated {T} — adds 1 mana
This land becomes a 3/3 Elemental creature until end of turn. It's still a Cave land. Activate only if the number of other Caves you control plus the number of Cave cards in your graveyard is three or greater.
activated {2} — turns something into a creature
Causes: nothing.
Cares about: nothing.
a Cave enters the battlefield — 18 cards in the game can cause this (Cavernous Maw is one).
a Cave it grants abilities to — 21 cards in the game can cause this.
20 other cards cause it too. These are the ones with the most connections.
a land enters the battlefield — 1,560 cards in the game can cause this (Cavernous Maw is one).
When Cavernous Maw enters:
199 other cards care about it too. These are the ones with the most connections.