edhseer Commander synergy, explained
Instant
Mana cost: {2}{U}{U}
Look at the top X cards of your library, where X is the amount of mana spent to cast this spell. Put two of them into your hand and the rest on the bottom of your library in a random order.
on-cast — puts cards into your hand
Flashback {5}{U}{U}
Causes: nothing.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Memory Deluge is one).
When Memory Deluge 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 (Memory Deluge is one).
When Memory Deluge is cast:
5 other cards care about it too. These are the ones with the most connections.