edhseer Commander synergy, explained
Instant — Arcane
Mana cost: {1}{U}
Look at the top five cards of your library. You may reveal an instant or sorcery card from among them and put it into your hand. Put the rest on the bottom of your library in any order.
on-cast — searches a library
Causes: nothing.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Peer Through Depths is one).
When Peer Through Depths 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 (Peer Through Depths is one).
When Peer Through Depths is cast:
5 other cards care about it too. These are the ones with the most connections.