edhseer Commander synergy, explained
Instant
Mana cost: {1}{U}
Web-slinging {U}
Counter target instant spell, sorcery spell, or triggered ability.
on-cast —
Causes: counter an instant, counter a sorcery.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Spider-Sense is one).
When Spider-Sense is cast:
427 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 (Spider-Sense is one).
When Spider-Sense is cast:
5 other cards care about it too. These are the ones with the most connections.