edhseer Commander synergy, explained
Instant
Mana cost: {1}{U}
Look at the top four cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.
on-cast — puts cards into your hand
Causes: nothing.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Impulse is one).
When Impulse 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 (Impulse is one).
When Impulse is cast:
5 other cards care about it too. These are the ones with the most connections.