edhseer Commander synergy, explained
Land
This land enters tapped.
Add {B} or {R}.
activated {T} — adds 1 mana
Until end of turn, this land becomes a 2/2 black and red Elemental creature with that ability It's still a land.
activated {1}{B}{R} — turns something into a creature
activated {1}{B}{R} — grants a keyword
This creature gets +X/+0 until end of turn.
activated {X} — gives +X/+0
Causes: nothing.
Cares about: nothing.
a land enters the battlefield — 1,560 cards in the game can cause this (Lavaclaw Reaches is one).
When Lavaclaw Reaches enters:
199 other cards care about it too. These are the ones with the most connections.