edhseer Commander synergy, explained
Sorcery
Mana cost: {2}{G}
All creatures able to block target creature this turn do so.
That creature gains indestructible until end of turn if you control a creature with power 4 or greater.
on-cast — grants a keyword
Causes: nothing.
Cares about: nothing.
a sorcery is cast — 3,720 cards in the game can cause this (Roar of Challenge is one).
When Roar of Challenge is cast:
424 other cards care about it too. These are the ones with the most connections.
anything is cast — 31,128 cards in the game can cause this (Roar of Challenge is one).
When Roar of Challenge is cast:
5 other cards care about it too. These are the ones with the most connections.